I have been using Joplin for a while now and faced some technical problems in Joplin but was able to solve all of them and very happy with it. I try my best to not use big tech solution like google/amazon/dropbox so I used one of the free NextCloud providers; Ocean Tab Digital. Everything was great except when their server went down without any notice for two days. Not being able to sync my notes I moved all of my notes to another provider named LinuxFabrik. It was working good for a month until last few days Joplin stopped syncing and showing strange error. I couldn't even log in to their web so I contacted their customer support (3/4 days ago) and received this email today.
I am not trusting those free providers again, if you are using them be warned.