adjusting brightness of photos
how do you adjust the brightness of photos in photopia?
Look for a 'trash can' icon next to that "Brightness" option under the "Adjustments" tab. If you see that icon, hover over it and you should see a "Remove Animation" tooltip, indicating that the "Brightness" option is 'animated'. Once an option has been set to a specific value under the "Animations" tab it can no longer be set from the "Adjustments" tab. The value(s) from the "Animations" tab effectively become authoritative.
Clicking that 'trash can' icon will automatically remove any values specified under the "Animations" tab, thus restoring functionality (and the missing slider) under the "Adjustments" tab. Alternatively, any "Brightness" changes you need to make can be implemented under the "Animations" tab, although these changes would be more appropriately implemented under the "Adjustments" tab if "Brightness" is intended to remain at a static value for the lifespan of the layer.
If this does not address the situation you're seeing, please reach out through the Contact Us form on our website and we'll be happy to troubleshoot the issue with you further.