Can't upload music on my t-sonik 840 - Transcend T-Sonic 840 MP3 Player

Here are some troubleshooting steps to resolve common errors when trying to upload audio files.
Start a new session
If you've had the upload page open for a while, your session may have timed out.
Start by closing all Transistor tabs in your browser. Log back in to Transistor and re-try the upload again.
Test your connection
If you have a large file uploading over wifi, the upload may stop if your Internet connection drops out.
You could identify this by testing a smaller file upload to see if it completes. Or testing on a another device with a different Internet connection
Check your audio file
If there has been any issues with exporting your audio file, or the audio is corrupt in some way it won't accept it as a valid file within the app.
Check your audio file has exported correctly by checking it plays as expected before uploading it to Transistor.
Change the file name
Occasionally uploads can break if your filename is very long or if it has any special characters in it like / ? ! * _ etc
Rename your audio file to something simple e.g. episode10.mp3 and re-try the upload again.
Update: We have released a fix for this so this should no longer cause an issue.
Check the file format
If you are uploading audio files check your files have the correct file extension and are not an unknown file type.
Transistor accepts AAC, WAV and MP3 audio formats (MP3 is preferred)
Check the file type
The audio upload box and podcast artwork boxes are next to each other in the interface.
Check that you are trying to upload an audio file using the audio uploader.
You will get an error if you try to upload an audio file to the image uploader and vice versa.
Check the file size
Your audio upload may timeout if the file size is too large.
We recommend that your audio files are kept under 200MB in size.


Greeting,
Rachel Gomez

MP3 players can only play music files in mp3 file format. You can download mp3 music files from the Internet to your computer and then copy them to your MP3 player using the USB cable. For your CD collection, you need to convert your CDs to mp3 music files onto your computer or download them from the Internet and then copy them to your MP3 player after you have connected the USB cable to the MP3 player and the computer.
You can do this using Windows Media player and Rip the CDs - Media Player will create a MP3 music file for each music track. Click on this link for instruction on converting music files to mp3 file format :- http://www.fixya.com/support/r5798418-creating_transferring_mp3_music_files