How do I add a foto.
Are you talking about this: https://www.garmin.com/en-GB/blog/new-garmin-connect-features-share-your-success-and-award-your-effort/ ?
If so, see https://forums.garmin.com/showthread.php?370369-photo-share-not-working&p=949486#post949486
Instead of share on Facebook or twitter, choose mail.
Mail at yourself.
Easier, but not necessary for Garmin to allow.