IOS Auto Upload Photos/Videos Error

Hello. I have NextCloud on my iPhone to upload on wifi only (not cell). I noticed when there's a new picture and I'm not connected to wifi, if I open the NextCloud app, it recognizes there's a new picture(s) to upload. However, if I close the app, those new pictures to be uploaded are removed from the upload queue without uploading.

Expected behaviour

With auto upload enabled only on wifi, to keep the new pictures to be uploaded in the queue until connected to wifi and they are actually uploaded.

Actual behaviour

If the NextCloud app is closed before connecting to wifi and being uploaded, the new pictures are simply removed from the queue.

Steps to reproduce

Disconnect from wifi,
take a picture,
open the NextCloud app - the pictures are queued to be uploaded,
close and then open the NextCloud app - the pictures are removed from the queue.

iOS version

12.2

App version

2.23.5.1

Server configuration

NextCloud version 15.0.7 running as a snap on Ubuntu 16.04

Operating system:
Ubuntu 16.04 snap

Web server:
Ubuntu 16.04 snap

Database:
Ubuntu 16.04 snap

PHP version:
Ubuntu 16.04 snap

Nextcloud version: (see Nextcloud admin page)
NextCloud version 15.0.7 running as a snap on Ubuntu 18.04

sudo snap list shows
nextcloud 15.0.7snap2 13144 stable nextcloud✓ -

Start by reproducing the auto-upload queue behavior described: create a photo while disconnected from Wi‑Fi, open the Nextcloud app, close it, and reopen it. Trace how queued photos are retained until Wi‑Fi is available; done means queued photos remain pending and upload after reconnecting to Wi‑Fi.