If you are posting videos on Google Photos that have a file format that is not listed below; then, the file size will count against your online storage total. Video file sizes can add up quickly.
If you use Google Photos to store video files, you likely are happy you have unlimited space (with some compression). However, there’s a new limitation to this unlimited storage.
The new policy took effect on December 6, 2018.
The supported video file formats are: .mpg, .mod, .mmv, .tod, .wmv, .asf, .avi, .divx, .mov, .m4v, .3gp, .3g2, .mp4, .m2t, .m2ts, .mts, and .mkv.