There are some types of file (by extension, such as .txt) that can be uploaded. These are set by the powers that run the site.
You can post the .lbr2 file in a couple of ways. Most just ‘drag and drop’ the file on the window they type their reply. You can also use the upload icon in the toolbar 
There is also a size limit of 4.5mb, I think. If you wish to post something larger, such as a video, you can put it in something like your ‘google drive’ and get a ‘link’ from google and post the link by pasting in your reply. You need to right click (google) to ensure ‘anyone with link’ can access it.
How big is your clock? Did you drill it with a glass or masonry bit?
