IMO, FOSS doesn’t do well with cross platform note taking and task tracking. I find it best to have two separate, but complimentary, workflows for mobile and desktop note taking.
My mobile notes are things like door combinations or pill counts/dosages/spellings, or travel info for longer/complex trips. Things I need at hand and that I can check quickly. I just use the default android app. Or very often just a piece of paper.
I use org roam with git for my computers. These are mostly code snippets, articles, journaling, etc. Things that are involved to the point I would rather wait for a keyboard than work on them with a phone. Same is true for writing on a desk rather than a pad.
I do have a few ways to go between devices:
I can read my computer notes on gitlab if needed
I use Signal Note to Self to keep or send one offs and images. (SUPER handy!)
Firefox syncs tabs
Probably a few others, but I don’t take pictures of my computer screen because I’m not an animal.
My workflows are pretty orthogonal, so this works well for me. Your mileage may vary.