Yes, there's definitely something wrong with uploading small (about 1kB) text files. I'm using the latest 108 and Opera:
- one single text file always uploads perfectly and results with the OK notification
- two text files only rarely succeed, normally it just uploads the first one, but gets stuck on second one. No OK notification on neither one...the whole page is just stuck loading something. No merging here though.
- three text files never succeeded
- binary files, no matter how many of them, always succeed