To add or change a profile photo or video on Tiktok follow below the process:
1. Tap Profile in the bottom right.
2. Tap Edit Profile.
3. Tap Change Photo or Change Video.
4. For photo, select Take a photo or Upload photo. For video, select from your gallery.
Note: Profile photos will not be visible on your profile once a profile video is set. Photos must be at least 20×20 pixels to upload.