diff --git a/crates/matrix-sdk-indexeddb/src/event_cache_store/transaction.rs b/crates/matrix-sdk-indexeddb/src/event_cache_store/transaction.rs
index e404ef4ac..7002b5968 100644
--- a/crates/matrix-sdk-indexeddb/src/event_cache_store/transaction.rs
+++ b/crates/matrix-sdk-indexeddb/src/event_cache_store/transaction.rs
@@ -26,8 +26,9 @@ use crate::{
     error::AsyncErrorDeps,
     event_cache_store::{
         serializer::indexed_types::{
-            IndexedChunkIdKey, IndexedEventIdKey, IndexedEventPositionKey, IndexedEventRelationKey,
-            IndexedEventRoomKey, IndexedGapIdKey, IndexedLeaseIdKey, IndexedNextChunkIdKey,
+            IndexedChunk, IndexedChunkIdKey, IndexedEventIdKey, IndexedEventPositionKey,
+            IndexedEventRelationKey, IndexedEventRoomKey, IndexedGapIdKey, IndexedLeaseIdKey,
+            IndexedNextChunkIdKey,
         },
         types::{Chunk, ChunkType, Event, Gap, Lease, Position},
     },
@@ -248,9 +249,11 @@ impl<'a> IndexeddbEventCacheStoreTransaction<'a> {
     /// Add a chunk and ensure that the next and previous
     /// chunks are properly linked to the chunk being added. If a chunk with
     /// the same identifier already exists, the given chunk will be
-    /// rejected.
-    pub async fn add_chunk(&self, chunk: &Chunk) -> Result<(), TransactionError> {
-        self.add_item(chunk).await?;
+    /// rejected. When the item is successfully added, the
+    /// function returns the intermediary type [`IndexedChunk`] in case
+    /// inspection is needed.
+    pub async fn add_chunk(&self, chunk: &Chunk) -> Result<IndexedChunk, TransactionError> {
+        let indexed = self.add_item(chunk).await?;
         if let Some(previous) = chunk.previous {
             let previous_identifier = ChunkIdentifier::new(previous);
             if let Some(mut previous_chunk) =
@@ -269,7 +272,7 @@ impl<'a> IndexeddbEventCacheStoreTransaction<'a> {
                 self.put_item(&next_chunk).await?;
             }
         }
-        Ok(())
+        Ok(indexed)
     }
 
     /// Delete chunk that matches the given id and the given linked chunk id and
diff --git a/crates/matrix-sdk-indexeddb/src/media_store/transaction.rs b/crates/matrix-sdk-indexeddb/src/media_store/transaction.rs
index 8d895148b..e9b6efb7d 100644
--- a/crates/matrix-sdk-indexeddb/src/media_store/transaction.rs
+++ b/crates/matrix-sdk-indexeddb/src/media_store/transaction.rs
@@ -24,11 +24,12 @@ use ruma::MxcUri;
 use crate::{
     media_store::{
         serializer::indexed_types::{
-            IndexedCoreIdKey, IndexedLeaseIdKey, IndexedMediaContentIdKey,
-            IndexedMediaContentSizeKey, IndexedMediaIdKey, IndexedMediaLastAccessKey,
-            IndexedMediaMetadataContentSizeKey, IndexedMediaMetadataIdKey,
-            IndexedMediaMetadataLastAccessKey, IndexedMediaMetadataRetentionKey,
-            IndexedMediaMetadataUriKey, IndexedMediaRetentionMetadataKey, IndexedMediaUriKey,
+            IndexedCoreIdKey, IndexedLeaseIdKey, IndexedMedia, IndexedMediaContent,
+            IndexedMediaContentIdKey, IndexedMediaContentSizeKey, IndexedMediaIdKey,
+            IndexedMediaLastAccessKey, IndexedMediaMetadata, IndexedMediaMetadataContentSizeKey,
+            IndexedMediaMetadataIdKey, IndexedMediaMetadataLastAccessKey,
+            IndexedMediaMetadataRetentionKey, IndexedMediaMetadataUriKey,
+            IndexedMediaRetentionMetadataKey, IndexedMediaUriKey,
         },
         types::{Lease, Media, MediaCleanupTime, MediaContent, MediaMetadata, UnixTime},
     },
@@ -223,8 +224,10 @@ impl<'a> IndexeddbMediaStoreTransaction<'a> {
     }
 
     /// Adds [`Media`] to IndexedDB. If an item with the same key already
-    /// exists, it will be rejected.
-    pub async fn add_media(&self, media: &Media) -> Result<(), TransactionError> {
+    /// exists, it will be rejected. When the item is successfully added, the
+    /// function returns the intermediary type [`IndexedMedia`] in case
+    /// inspection is needed.
+    pub async fn add_media(&self, media: &Media) -> Result<IndexedMedia, TransactionError> {
         self.add_item(media).await
     }
 
@@ -448,11 +451,13 @@ impl<'a> IndexeddbMediaStoreTransaction<'a> {
     }
 
     /// Adds [`MediaMetadata`] to IndexedDB. If an item with the same key
-    /// already exists, it will be rejected.
+    /// already exists, it will be rejected. When the item is successfully
+    /// added, the function returns the intermediary type
+    /// [`IndexedMediaMetadata`] in case inspection is needed.
     pub async fn add_media_metadata(
         &self,
         media_metadata: &MediaMetadata,
-    ) -> Result<(), TransactionError> {
+    ) -> Result<IndexedMediaMetadata, TransactionError> {
         self.add_item(media_metadata).await
     }
 
@@ -603,8 +608,13 @@ impl<'a> IndexeddbMediaStoreTransaction<'a> {
     }
 
     /// Adds [`MediaContent`] to IndexedDB. If an item with the same key already
-    /// exists, it will be rejected.
-    pub async fn add_media_content(&self, content: &MediaContent) -> Result<(), TransactionError> {
+    /// exists, it will be rejected. When the item is successfully added, the
+    /// function returns the intermediary type [`IndexedMediaContent`] in case
+    /// inspection is needed.
+    pub async fn add_media_content(
+        &self,
+        content: &MediaContent,
+    ) -> Result<IndexedMediaContent, TransactionError> {
         self.add_item(content).await
     }
 
diff --git a/crates/matrix-sdk-indexeddb/src/transaction/mod.rs b/crates/matrix-sdk-indexeddb/src/transaction/mod.rs
index 4604c8241..078e96537 100644
--- a/crates/matrix-sdk-indexeddb/src/transaction/mod.rs
+++ b/crates/matrix-sdk-indexeddb/src/transaction/mod.rs
@@ -359,23 +359,21 @@ impl<'a> Transaction<'a> {
 
     /// Adds an item to the corresponding IndexedDB object
     /// store, i.e., `T::OBJECT_STORE`. If an item with the same key already
-    /// exists, it will be rejected.
-    pub async fn add_item<T>(&self, item: &T) -> Result<(), TransactionError>
+    /// exists, it will be rejected. When the item is successfully added, the
+    /// function returns the intermediary type [`Indexed::IndexedType`] in case
+    /// inspection is needed.
+    pub async fn add_item<T>(&self, item: &T) -> Result<T::IndexedType, TransactionError>
     where
         T: Indexed + Serialize,
         T::IndexedType: Serialize,
         T::Error: AsyncErrorDeps,
     {
-        self.transaction
-            .object_store(T::OBJECT_STORE)?
-            .add(
-                self.serializer
-                    .serialize(item)
-                    .map_err(|e| TransactionError::Serialization(Box::new(e)))?
-                    .value,
-            )
-            .await
-            .map_err(Into::into)
+        let output = self
+            .serializer
+            .serialize(item)
+            .map_err(|e| TransactionError::Serialization(Box::new(e)))?;
+        self.transaction.object_store(T::OBJECT_STORE)?.add(output.value).await?;
+        Ok(output.indexed)
     }
 
     /// Puts an item in the corresponding IndexedDB object