upload music into icloud

Does the song meet all the requirements?

More about iTunes Match

• iTunes Match is limited to 100,000 songs.
• iTunes Store purchases made with the same Apple ID being used for iTunes Match don't count towards the 100,000 song limit.
• Unmatched content is uploaded as is. Upload time varies depending on the amounts uploaded and local network speeds.
• Song files larger than 200 MB won't upload to iCloud.
• Song files longer than two hours in length won't upload to iCloud.
• Songs containing DRM (Digital Rights Management) won't match or upload to iCloud unless your computer is authorized for playback of that content.
• After you subscribe to iTunes Match, Genius associates information about your iTunes library with your Apple ID. You can't disable Genius while using iTunes Match.

About file formats

• If you have songs encoded in ALAC, WAV, or AIFF formats, we create an AAC 256Kbps version and upload it to iCloud so that it can be played on all of your other devices. Your original music file remains untouched on your Mac or PC.
• Songs encoded in AAC or MP3 formats that don't meet certain quality criteria aren't matched or uploaded to iCloud.
• Songs encoded as MP3 or AAC that have been matched to the iTunes Store are made available for download as 256 kbps as AAC from iCloud.
• Matched songs in your local library don't automatically transcode to 256 kbps AAC. To get a higher quality transcoding, download the matched songs from iCloud.

iTunes Match - Subscribe

Is it occurring with only one specific music file?