You can upload a variety of image and file types to your post as attachments.
The following are supported types and size limitation.
Note: The maximum number of attachments per message is 2. You can upload up to 50 images per post or article.
If you need additional file types or sizes, please contact the community.
I know how to upload images with "Photos" button. But what is the button I must click on to upload zip files ?
In the bottom of post form, there is 'Choose Files' button.