If you are looking for the Post-it® digital app to sync notes with iCloud, it is available on the App Store . It allows you to digitize physical sticky notes and organize them across devices.
To "post" photos for others to see, you can create an iCloud Link . Select your photos on iCloud.com/photos , click the share icon, and choose Copy Link to send it to others. icloud
To "post" or upload files to iCloud, you can go to the iCloud Drive website . Click the Upload button in the toolbar to select files from your computer or mobile device. If you are looking for the Post-it® digital
The phrase "post: icloud" could refer to a few different things depending on what you're trying to do. Here are the most likely interpretations: Select your photos on iCloud