Before trying to upload a track, make sure that you've saved it under one of the supported file formats. As good practice, always go for the best quality you can provide.

• Winamp accepts WAV, FLAC, PCM, MP3, AAC
• Bit depth: 16 or 24
• Sample rate: 44.1 or 48 kHz 
• Mono or stereo
• Maximum size of a single file is 100 MB.

Any other format cannot be uploaded correctly. These requirements and restrictions have been put in place to ensure the best sound quality.