Convert to JEPG

I’ve recently got an iPad Air and one of the things I use it for is to upload photos from my Nikon camera. There I shoot at RAW and transfer the files via an SD card connector and everything gets stored it the Files app of my iPad. The iPad provides a build in support to convert RAW to JPEG when you are done with the edits and it almost works. What I mean is - it converts correctly, but when I select multiple files to be converted it only converts one of them instead of all.

Is this a common issue - anyone else facing this or am I doing something wrong somehow?

Adding a link to a screen recording of what I’ doing: https://share.icloud.com/photos/0b46bBfbu1PjpqA5ryWMdgAgA