t0fr, 9 months ago I like Logseq. It doesn’t meet your first requirement, where the image is in the title. But I do insert images in-line in my notes. But it has tagging, can be synced with syncthing or whatever application of your choice, and is cross platform.
I like Logseq. It doesn’t meet your first requirement, where the image is in the title. But I do insert images in-line in my notes. But it has tagging, can be synced with syncthing or whatever application of your choice, and is cross platform.