Might want to ask in !opensource@lemmy.ml, since you'll probably get a wider audience than asking in a KDE-specific community.
KDE
KDE is an international technology team creating user-friendly free and open source software for desktop and portable computing. KDE’s software runs on GNU/Linux, BSD and other operating systems, including Windows.
Plasma 6 Bugs
If you encounter a bug, proceed to https://bugs.kde.org, check whether it has been reported.
If it hasn't, report it yourself.
PLEASE THINK CAREFULLY BEFORE POSTING HERE.
Developers do not look for reports on social media, so they will not see it and all it does is clutter up the feed.
Hey there! My note-taking app works on Linux, welcome to check it out: get-notes.com
Currently, there's no sync or mobile app, but that's in the works.
I use Joplin with a selfhosted sync server but tbh I almost never use it on Android because it's just so cumbersome. Would be up for reccs as well. There's Nextcloud Notes (no desktop, only browser afaik) and a lot of people seem to be using rabdom Markdown note editors and syncing that with Syncthing but I've had bad experiences with that kn the past (stuff not being synced, constant conflicts etc).