Updated at: 2022-01-10
Yes. Currently, links created by guests expire in 1 hour. Links created by users on Zero (free) plan expire in 24 hour. See more here.
Spaces may be used just to "tag" links (like Gmail labels) and, additionally, to set default IP/port combinations. So in case you work with 2 or more servers (and different IP addresses), you can add them as Spaces. When adding a Link, select the according Space (leaving IP/port blank) and the generated link will follow the Space routing settings automatically. You can update the routing settings on a Space and the changes will reflect on all Links within that Space.
If you are hotlinking images from hosts other than the one you've set in the temporary link creation, they may be offline. See more here.
If you are seeing a blank page, try setting the HTTPS port to 80. If the issue persists, see more here.