I'm doing some testing to see what the best format / upload site is.

.gif file, 7.24MB, uploaded to giphy.com

Desktop

web:
Thumbnail? yes, Loads in post? yes, Loop? yes
alexandrite:
Thumbnail? no, Loads in post? no, Loop? yes (on click-through to external site)
photon:
Thumbnail? yes, Loads in post? yes, Loop? yes

Mobile

sync:
Thumbnail? no, Loads in post? yes, Loop? yes
voyager:
Thumbnail? yes, Loads in post? yes, Loop? yes
connect:
Thumbnail? yes, Loads in post? yes, Loop? yes
liftoff:
Thumbnail? yes, Loads in post? yes, Loop? yes
jerboa:
Thumbnail? no, Loads in post? no, Loop? yes (on click-through to external site)

I don't have access to every front-end and mobile app available. Please share your experiences with whatever it is you use. Thanks.

(gif is from the film Bottoms, btw)