Thank you! I received the email with the test account credentials. I could login and can reproduce the error.

I'll try to find out what's going on. I'll get back to you when I know more.

A test account would be great.

Update: I have tried to reproduce the problem by uploading a file to my Synology Diskstation's WebDAV server and uploading an existing file worked without problems, so it may be a problem specific to your WebDAV server software.

Ok, thanks for trying it out.

Since I don't currently have a cPanel server: 

Would it be possible to give me a test account on the server so I can try to reproduce it with your WebDAV server?

You can send the login details to support@textasticapp.com so it isn't shown on the public feedback forum.

Thanks a lot for the video.

This is not the expected behavior. But in this case, the problem might actually be that you are trying to upload a file with a size of 0 bytes. Please try if uploading a non-empty file works.

I'll try to reproduce the problem. Maybe there is a bug when uploading empty files over WebDAV.

It's great to hear that it works now!

Also, you don't need to restart the app.

Just use Settings -> Other -> Reload Customizations or use Cmd-Shift-R to reload customizations.

On iPad with an external keyboard, you can show the scope at the cursor location by using the keyboard shortcut Control-Shift-P. 

Please check that "source.geo" is the correct scope.

The correct folder is "Local Files/#Textastic/CodeCompletion" (not CodeCompletions)

Can you please give me an example .geo file and tell me which syntax definition you are using?