Preview of Null file is requested when "Transfer" tab is open

[skjerns]

When uploading my photo library I discovered that there are many 404s in my access log. These request a preview of an empty file id. This only occurs when I have the "Transfer" tab is open.

Steps to reproduce

1. Upload files via Automatic Photo Uploading
2. Open "Transfer" tab

The following requests appear en-masse in my access log (dozens per second after uploading a file) wh

2024-12-22 10:43:36	Error	2003:e5:9f13:c800:502e:xxxx	404	GET /index.php/core/preview?fileId=&x=1024&y=1024&a=1&mode=cover&forceIcon=0&mimeFallback=0 HTTP/1.0

the iOS log says the following about this:

2024-12-22 10:51:22 [INFO] Upload complete https://nextcloudinstance.dummy.de/remote.php/dav/files/Simon/Camera Uploads/2016-08-14 18-11-45_2235.mov, result: success(19183362 bytes)
2024-12-22 10:51:23 Network request started: GET https://nextcloudinstance.dummy.de/index.php/core/preview?fileId=&x=1024&y=1024&a=1&mode=cover&forceIcon=0&mimeFallback=0
2024-12-22 10:51:23 Network request headers: ["Content-Type": "application/x-www-form-urlencoded", "OCS-APIRequest": "true", "User-Agent": "Mozilla/5.0 (iOS) Nextcloud-iOS/6.2.1", "Accept": "application/json", "Authorization": "Basic TOKENRETRACTED"]
2024-12-22 10:51:23 Network request body: None
2024-12-22 10:51:23 Network request started: GET https://nextcloudinstance.dummy.de/index.php/core/preview?fileId=&x=1024&y=1024&a=1&mode=cover&forceIcon=0&mimeFallback=0
2024-12-22 10:51:23 Network request headers: ["Content-Type": "application/x-www-form-urlencoded", "OCS-APIRequest": "true", "User-Agent": "Mozilla/5.0 (iOS) Nextcloud-iOS/6.2.1", "Accept": "application/json", "Authorization": "Basic TOKENRETRACTED"]
2024-12-22 10:51:23 Network request body: None
2024-12-22 10:51:23 Network request started: GET https://nextcloudinstance.dummy.de/index.php/core/preview?fileId=&x=1024&y=1024&a=1&mode=cover&forceIcon=0&mimeFallback=0
2024-12-22 10:51:23 Network request headers: ["Content-Type": "application/x-www-form-urlencoded", "OCS-APIRequest": "true", "User-Agent": "Mozilla/5.0 (iOS) Nextcloud-iOS/6.2.1", "Accept": "application/json", "Authorization": "Basic TOKENRETRACTED"]
2024-12-22 10:51:23 Network request body: None
2024-12-22 10:51:23 Network request started: GET https://nextcloudinstance.dummy.de/index.php/core/preview?fileId=&x=1024&y=1024&a=1&mode=cover&forceIcon=0&mimeFallback=0
2024-12-22 10:51:23 Network request headers: ["Content-Type": "application/x-www-form-urlencoded", "OCS-APIRequest": "true", "User-Agent": "Mozilla/5.0 (iOS) Nextcloud-iOS/6.2.1", "Authorization": "Basic TOKENRETRACTED", "Accept": "application/json"]
2024-12-22 10:51:23 Network request body: None

Environment data

iOS version: 18

Nextcloud iOS app version: 6.2.1.0

Server operating system:

Web server: Apache, nginx

PHP version: 8.3

Nextcloud version: 30.0.4