File upload issues
First, please make sure that your file is in a format that will work in VoiceThread. Find more information.
If your file does upload but the pages do not look quite right, please save your file as a PDF, and then upload that version to VoiceThread. This will ensure that your slide design is preserved.
Finally, it could be that your browser or network settings need to be adjusted. Find more about adjusting browser cookie settings for a personal computer and network requirements if you’re working on a local area network.
Note: Free account holders cannot upload files larger than 25 MB. Upgraded accounts can upload files up to 3 GB.