Thank for writing in.
Relating to your query here, please ensure that you first unzip and extract that zip file.
One this is done, zip the folder containing the theme files and try uploading it once again.
Thanks for these screenshots.
Checking on your last screenshot, you seem to have two folders named music-colorlib, whereby one is nested in the other. Please generate a zip file of the last “music-colorlib” folder and upload it.