Android v11.3.1: “Save copy to device” fails with “Couldn’t complete export,” while v11.2.2 works normally

Hello, I would like to report an issue with “Save copy to device” in Lightroom Mobile for Android.

Device / Platform
My smartphone is an Android phone.
I am using Lightroom Mobile v11.3.1 on my Android smartphone.

Issue
When I open a photo in Lightroom Mobile and choose
Share → Save copy to device,
I get the error message:
“Couldn’t complete export”
and the photo is not saved to my Android device.

What I have already checked

• My Adobe account is correct.
• Cloud sync is working properly.
• The same photos are visible in Lightroom on my laptop.
• The same photos are also visible in Lightroom Web.
• My Android phone has enough free storage space.
• I restarted the phone.
• I uninstalled and reinstalled Lightroom.
• After reinstalling, I signed in again and completed syncing.
• Use Cellular Data is enabled in Lightroom settings.
• I force-stopped the app and reopened it.
• I also cleared the app cache.
• I tried Store locally for an album, but it also did not work properly.

Comparison test

• On my Galaxy Tab / Lightroom v11.2.2,
  using the same Adobe account and the same cloud photos,
  “Save copy to device” works normally.
• On my Android smartphone / Lightroom v11.3.1,
  under the same conditions,
  I get the error
  “Couldn’t complete export.”

My suspicion
This may be related to a regression or compatibility issue in v11.3.1 affecting Save copy to device / Export to device on Android smartphones.

Request

• Please confirm whether this is a known issue.
• Please let me know if there is any workaround.
• I can provide more details or run additional tests if needed.
  
  This post has been moved to the bulletin lightroom board by a moderator.