I’ve uploaded some tracks to master them - some of them have a grey play button, can’t be played or send to instant mastering.
in the details there is a red sentence “file has already been used”
what am I doing wrong
Hi @osa
Thank you for your message. Someone from the iMusician Team will get back to you shortly, and take care of your request. Please be patient 
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Hello @osa,
The error message “This audio file has already been used” indicates that the audio file you are trying to assign to your track is already in your library. This basically means that you are trying to upload the same audio file twice to two different tracks, which is not possible. Please make sure that you do not have any duplicate tracks (i.e. the same track several times) in your library and that the audio file is only allocated once.
Have a nice weekend 
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