Lightroom mobile "couldn't complete export"

I've been using LR mobile on my phone flawlessly for months, even exporting hundreds of photos at once for a certain job. Yesterday during a wedding I was editing and exporting single photos normally with no issues. Suddenly "1 photo failed to export". Retry option gives an instant same error. This is happening on my phone, Xiaomi Note 9 Pro, wich hasn't exported a single photo since then. Tested on a tablet minutes ago and apparently no issues. On my phone I've already tried the following:

- cleaning the app cache

- cleaning the phone general cache

- restarting the phone

- cleaning all app data, forcing a new login

- reinstalling the app completely

- reimporting a photo I'm trying to export

- shamefully tried to export at a lower output size as shown on some poor YouTube videos suggest

Nothing worked. I repeated those steps dozens of times using different combinations. There was no app version or phone OS changes since the error appeared while I was using LR and that changes can't happen meanwhile. I use LR mobile for work so I really hope to solve this.