Click on "my files" (folder icon) on the left side of the window.
Click on the three dots next to the file you wish to share, bringing up options for that file. Then, click on "Share"
In the sharing window, click on the settings gear icon to bring up the sharing settings.
For sharing 3D print files to the library, make sure you have clicked "anyone" and then click "apply". Afterwards, you can click on "copy link" and paste that into the 3D print submission form.
