You mentioned you were interested in cross-platform--- does that mean you were using a sync service to sync your files between Windows and Android? I wonder if something with the sync program messed it up. Third party sync services overwrite files, Obsidian's paid Sync feature tends to merge conflicting file content instead of wiping out one file in favor of the other.
Also, you never messed with vault nesting did you?
Lastly, if you were using a third-party sync service, check if it has some kind of version history tool so you can try and recover the files you're missing if they're important.
Hope some of this is insightful or perhaps even useful. Good luck :D
Edit: One extra detail-- I noticed you haven't tried Notion yet. That's the service a lot of newer non-backlink oriented apps seem to be basing themselves on. It's great and has cross-platform apps if you don't mind all of your data being permanently on their servers and being only exportable to a certain degree. It also probably still has the largest quantity of documentation / examples / people to get setup inspiration from out of all of the apps.
I'll also mention that every cloud-based app that's been around long enough has had issues with data loss due to their own bugs, sync issues, or internet connectivity issues. Use what you're comfortable with but once there's a sync layer involved something can always go wrong.
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You mentioned you were interested in cross-platform--- does that mean you were using a sync service to sync your files between Windows and Android? I wonder if something with the sync program messed it up. Third party sync services overwrite files, Obsidian's paid Sync feature tends to merge conflicting file content instead of wiping out one file in favor of the other.
Also, you never messed with vault nesting did you?
Lastly, if you were using a third-party sync service, check if it has some kind of version history tool so you can try and recover the files you're missing if they're important.
Hope some of this is insightful or perhaps even useful. Good luck :D
Edit: One extra detail-- I noticed you haven't tried Notion yet. That's the service a lot of newer non-backlink oriented apps seem to be basing themselves on. It's great and has cross-platform apps if you don't mind all of your data being permanently on their servers and being only exportable to a certain degree. It also probably still has the largest quantity of documentation / examples / people to get setup inspiration from out of all of the apps.
I'll also mention that every cloud-based app that's been around long enough has had issues with data loss due to their own bugs, sync issues, or internet connectivity issues. Use what you're comfortable with but once there's a sync layer involved something can always go wrong.