Copy and past printscreen not working

Hi, I have installed vikunja on a rasberry pi in a container in proxmox. This is working great, and i can access it without issues from other computers or mobiles.
However there is one thing that is not working. That is copy and past a printscreen to the description. I have tried this from a windows machine and from the rasberry pi.
But if i try it on https://try.vikunja.io/ then it is working. So now i am curious if this is some limitation in the docker image that i have pulled (latest) or is the try.vikunja.io running a different version?
Playing a bit more, it seems that also the image button is not working locally. I can select the file, but than nothing happens. While with the demo env. it shows up in the description.
Any other tips to troubleshoot it, would be nice as well.
Thanks

This has been fixed recently but not yet released as stable. You can switch to an unstable build or wait for the next release.