Please keep the uploaded file size below 15MB.
For a larger size file size please upload the file to a cloud storage such as Google Drive, iCloud, Dropbox, or OneDrive to upload the file and then send us the shared link to us. Make sure anyone can access your shared files or anyone with your permission can download them.
To view the file size:
PC> Right-click the file to see the File Properties
Mac> Click the file and then CMD + I
If you have more than four files to upload, we recommend to compress the file (ie.Zip) into an one file so we can manage the files better. Thank you for your understanding.