Transfer is not transcoding
The selected file remains the source delivery. A browser preview or player may have different compatibility, but that does not redefine the original object.
Codec compatibility
A recipient may need professional software even when the upload completed perfectly. State the container and codec in the handoff.
Use Live Relay for a different job
Live Relay passes through an existing authorized HLS stream. It does not convert this uploaded video into HLS.
Before the handoff
Will TransferSize lower my video quality?
The upload delivers the selected original file; TransferSize does not use messaging-style upload compression on it.
Why will my browser not preview it?
The browser may not support the codec. Download and open the original in compatible software.