Template:ColTilesRemote
The cards for Tsadra's Tibetan collection wikis, written once and shown on all of them.
Each collection site renders this row with:
{{#ask:[[Template:ColTilesRemote]]
|source=commons
|format=template
|template=ColTilesRemote
|link=none
|userparam={{SERVERNAME}}
}}
Passing commons.tsadra.org is what stops a site advertising itself: the value arrives as {{{#userparam}}} and each card compares it with its own host=.
To add a collection, add a {{SiteTile}} call above, wrapped in the same #ifeq. Upload its image here, not on the collection wiki — a remote #ask resolves everything on this wiki.
Pass the image as |imageurl={{filepath:NAME.jpg|240}}, never as image=. A File: link is resolved against whichever wiki the markup ends up on, and commons emits a site-relative /thumb.php?f=… path that returns 403 anywhere else — so every image in the row would break. filepath: runs here, where the file is native, and yields an absolute URL that any wiki can load.
Note {{{#userparam}}} is hash-prefixed. {{{userparam}}} and the numbered slots are never set; this was tested against a remote query before the template was written.