Here are a few suggestions:
If the upload progress is not moving, refresh the page and try again
Ensure there are no special characters in the upload
Ensure you are uploading a file type Sonix accepts. You can see the file types we accept here: https://help.sonix.ai/uploading-to-sonix/what-file-formats-can-i-upload-to-sonix
Ensure you have a strong Internet connection
If you are not using Chrome, we recommend Chrome. It is the most bug-free browser on the market.
If your file is very large, it can take much longer to upload depending on your Internet connection. In these cases we suggest you get up and grab a coffee or a glass of water while you wait.