I know that everyone has been waiting a long time for sync and I want to reassure you that it is high on our list of priorities. As users of Squid ourselves, it’s something we really want as well! We appreciate your patience.
This is something we’ve been investigating since the app’s inception and we continue to investigate constantly. Syncing is a very difficult problem to solve, especially with regards to handwritten notes which can be combined with images and text and contain backgrounds from multiple PDFs. I don’t have an ETA for when sync will be supported, but rest assured this is a high priority for us. We appreciate everyone’s feedback on this idea.Gruff commented
I finally thought I'd found a note app that worked and then realised it has no concept of accounts or syncing. Gutted.
Don't overcomplicate the requirement, you don't need to merge conflicting edits as the first step, just sync docs and only allow them to be open on one at any time.
If squid supported sync and eventually live collaboration it would win hands down.