Hello,
Thank you for your message.
Remote Utilities doesn’t have any limitations on the size file. One thing you could check is that both remote Host and Viewer are updated to the latest version and there’s no version mismatch. Version mismatch might cause some small issues, especially since the File Transfer mode was completely revamped starting version 7.
If the issue occurs for updated Hosts and Viewers, please let us know.
Looking forward to your reply.