Arduino 2.X won’t accept whitespace in file names. That’s all.
Just use like a batch file renamer app and change all spaces to underscores.
FWIW, 2.3.4 is much better tthan the initial few releases. I have been a die hard 1.8.19 user up until yesterday.
I checked the web for the one thing I dislike and stumbled across my own post on their forums (because it’s still doing it).
However, the majority of things i was nitpicking about in that post have been addressed.
Primarily, I have a dark themed Serial Monitor now by using it, and it’s glorious.
Now if they would just fix the carriage return issue so the progress bar is properly shown on one line…
But the serial monitor now has history of commands entered, the markdown ReadMe, while still opened along with ProffieOS.ino, is not selected on opening, so it sits idly by out of the way, the settings window is dealable, and above all it’s themeable with any Visual Code theme you like for color coding and window color etc…
Another perk is displaying the Proffieboard plugin names properly.
So the pros outway the cons to me.
I don’t ever use spaces in user name or file or directory names anyway.