There is no limit to the number of photos or video posts that can be added.
On the web, individual image uploads can only be 10MB per image, but uploads via the app are not limited at all.
Video uploads are limited to 15 seconds (if the video file you select is too long, you will simply be asked to trim it, which you can do within the app before uploading). Video uploads are only an option through the app, and is not an upload option via the web. We currently do not support animated .gif files.
When uploading photos, we partially compress them to make the experience on your end better. The images saved are not original, but they are still considered high resolution.