Hi @WhiteNoise
I did search on this topic before creating this Bug Report.
The topic Poor Handling of `#` character in the filepath (aka hashtag, pound, octothorpe) - #11 by mmartin whose the final post was marked as a Solution with the following conclusion:
If I understand that right, Obsidian will support filename containing hash character. That is not the case with Obsidian Android app. Furthermore, even if Obsidian does not support it, the app refuses to load the folder without showing why.
This took me long enough to find out out of dozen of my notes. Then search for a place to see where I could report this. Searched on this forum if it was a known issue. Decided to post this because I thought it was a bug.
Thanks for creating Obsidian!