Android 3.0.3 auto upload fail after first install

Nextcloud version 13:
Operating system and version Debian 9:
Apache or nginx version Docker + nginx:

The issue you are facing:

Is this the first time you’ve seen this error? N:

Steps to replicate it:

  1. Install NextCloud Android App 3.0.3 on LineageOS 14.1-20180207 / Android 7.1.2
  2. Select Auto Upload from the menu
  3. Tap the cloud so it is blue
  4. Take a photo
  5. See a notification saying: “Upload failed: Cloud not complete operation. Server unavailable”
  6. Reboot the phone
  7. Run nextcloud
  8. See the newest photo is successfully uploaded

Update: after a week, filed a bug report in GitHub with the same information