You can't upload photos to the albums 'All Team Photos' or 'Your Photos', those are automatically created for you based on the photos you and your team upload.
From the app:
1. Go to the messaging tab and select Photos
2. Choose the album you'd like to add photos to
3. Then click the Camera icon in the top right corner
4. If you haven't already, grant the app permission to access your photos
5. Then select photos from your gallery & hit Done in the bottom right corner
If you'd like your fans to see the image, make it 'Public' by pressing the globe icon.
From the web:
Login to your account & select Photos from the left menu
Select the album you'd like to add photos to
Then click Add Photos.