Attempting to Save Online a yet unsaved or uncompressed (mscx) produces misleading error message
Steps to reproduce:
1. Create a minimal score with a title.
2. Save it as an uncompressed file (MSCX).
3. Save Online...
4. An error message will be displayed reading: "Cannot upload: Not Acceptable (Title cannot be blank.)
Save the score as a compressed file (MSCZ) and then upload.
This one bites me as I prefer MSCX files to MSCZ as they can be compared using a variety of tools.
I recognize this could be considered a musescore.com issue, but even so, if it is a musescore.com limitation, perhaps the application could compress a MSCX file as part the upload process.