By default, you cannot upload HD videos and photos to Facebook from an Android or an iPhone.
Here’s how you can change that:
Open the Facebook app.
On your iPhone, tap the three horizontal lines at the bottom. On Android, tap the three horizontal lines at the top.
Hit Settings & Privacy > Settings.
If you are on an Android device, tap Media and Contacts. If you have an iPhone device, tap Videos and Photos.
Enable the following options under the Video and Photo Settings section:
- Video Upload HD
- Photo Upload HD
That’s all. From now on, you can upload HD videos and photos from the Facebook app.
Note: You can revert by disabling the above options.