When uploading an episode to TalkShoe (either by the "Create & Upload" button or the "Upload Replacement Recording" feature), the maximum file size of the file to upload is 100MB.

Also, a couple of other things to consider, the upload file should be:
  • an mp3 file
  • is best to be either mono or "joint-stereo"
  • a sampling frequency of a multiple of 11,025 Hz (22,050 Hz is popular choice)
  • a bit rate quality of 64kbps or 96kbps