Importing Userdata (waypoints, tracks, etc..) to 7212

Since Garmin has essentially made Mac users switch from Homeport to Basecamp, I have not been able to successfully import my user data (when I export from computer to SD Card, my unit fails to recognize the file saved on SD card). After hours of back and forth with Garmin support with no luck, I borrowed my parents PC and was able to successfully download Homeport and export my .adm file to my SD Card.  I just tried to insert my SD card and merge the file to my 7212, and when I did so, I now have a message that reads "no waypoints found, no tracks found, transfer complete".  Please help.