File requirements for mastering

Your audio files should be final,
and in 32 bit (24bit for analogue recordings and mixdowns),
at native bitrate of your recording session.

Preparing files
Good practice: Mix without master bus processing (removed, not bypassed).
Eventually send master-bus processed mix as well for reference.
Add references to other music, if any.
Add a label copy, so the informational part is clear and can be copypasted, wherever necessary in the production process.
Thanks!

Note, that a file exchange after mixing or mastering has commenced may need to be additionally charged for.

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File upload -> Swisstransfer,
or provide an accessible download location w/o user account required.