Hi @smp86:matrix.org thanks for your interest. I agree there is work we need to do on the timeline view, the WIP ticket for this is here: photonixapp/photonix#8 .
Sorry to hear some photos didn't appear - if you could come up with a test case that reproduces the error (i.e. 2 photos you upload that always results in just one) that would be helpful. Please note that edits of a photo or photos taken of the same subject on the same camera are grouped together into just one photo in the timeline and you can view different "versions" in the info panel on the right.
I've worked through most of the PRs now (had some time off). There are others contributing individual features but most work has been by me so far. If you have ideas, please check the existing"Issues" on GitHub and submit them there first. It would be great to have your input.