docs: Add explanatory comment

app/src/main/java/com/infomaniak/swisstransfer/ui/screen/newtransfer/TransferSendManager.kt

@@ -43,12 +43,18 @@ class TransferSendManager @Inject constructor(
     private val uploadWorkerScheduler: UploadWorker.Scheduler,
 ) {
 
-    // TODO: Merge these two UI states in a single one for the whole flow of logic
     private val _sendStatus = MutableStateFlow<SendStatus>(SendStatus.Initial)
     val sendStatus = _sendStatus.asStateFlow()
 
     suspend fun sendNewTransfer(newUploadSession: NewUploadSession) {
+
+        // When clicking the "Send" button, a new session is created.
+        // If there is an error before reaching the UploadProgressScreen, we stay in ImportFilesScreen.
+        // Every time we'll click the "Send" button again, a new session will be created.
+        // So we'll have multiple UploadSession in Realm. We don't want that. We only want the last session.
+        // So before creating the new session, we need to remove the previous failed ones.
         uploadManager.removeAllUploadSession()
+
         val uploadSession = uploadManager.createAndGetUpload(newUploadSession)
         sendTransfer(uploadSession.uuid)
     }