Hi ElGordo51,
If the Photos section of iCloud.com shows no content, then there's no Photos content that's been uploaded to the iCloud Photos service. This doesn't necessarily mean you've never taken pictures or videos on a compatible device, it oftenmeans you've never enabled iCloud Photos to sync to the Apple ID you're logged into the website with.
There's no one other way to put the Photos content into this section of the iCloud website other than by enabling iCloud Photos on a device and having that device's Photos library uploaded to the iCloud website.
If you're certain iCloud Photos is enabled on your devices, then it's either you're logging into the incorrect Apple ID, or you have an account issue that may need to be addressed. Make sure that your iPhone and iPad are logged in with the same account you're using on the website. You can verify the account in Settings > [your_name], and the email address will be shown right on the top of the page for iPhone and iPad.
If you're sure that the Apple ID is the same one you're logging into, you'll have to arrange a call with Apple Support to solve any account issue you might have.
Set up a call with Apple Support here:
Get Support
Thanks for using the Apple Support Communities.