sending time-code embedded proxy files

I used to have a nice, easy workflow where I sent proxy files to a producer.

They're P2 files -- compressed via ProxyMill and sent via Dropbox. Easy, quick, and simple.

Then Dropbox "updated" their site, and they changed their method of transcoding.

I approached their tech-support team, and after 3 weeks they finally gave me a "workaround" that's complicated and just doesn't work.

So, anyone out there have a nice method of electronically transferring small H.264 files with an embedded time-code window??

Thanks.