Has .mbedignore been fixed in the online compiler

I am trying to ignore some files in my project during compile. A search indicated that .mbedignore capability was being added to the fix list in 2018. It appears this is not fixed as I see no way to create the file (only .c, .cpp, … file names allowed).

I tried the hack of creating the .mbedignore file on my desktop and copying it into my project. This did not work - it copied in the file but did not like the name. Now it won’t even let me delete the file.

How can I ignore files during compile using the online compiler?