Testing before you publish

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The final compile used the final compile settings, and cubemaps were built after the last compile.
Maps with NPCs include their nodegraph, maps/graphs/<mapname>.ain, rebuilt after the last compile.
There's a campaign file in campaigns/ with a unique name, not blackmesa.json.
The campaign file passes a JSON validator: no trailing commas, comments or curly quotes.
Campaign and chapter titles are plain text, not #TOKENS.
Every imageSource points at an image that's actually in the VPK, with the path written as image://game/....
Every chapter's levelName matches a .bsp in the VPK exactly, without .bsp.
Map names share one prefix and are numbered in play order, so later maps get their chapter's loading screen.
Multiplayer maps: maps/<mapname>.txt and all the map_backgrounds images (3 per camera) are included.
Custom materials, models and sounds are in your own folders, and nothing replaces a base game file (blackmesa.json, chapter_manifest.txt, resource/, cfg/, ui/themes/).
No working files are in the VPK: .vmf, .vmx, .log, texture or model sources.
The VPK isn't built from a copy of one of the game's VPKs (such as bms_misc_dir.vpk), and has no resource/bms_<language>.txt, gameui_ or closecaption_ files.

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Your campaign appears on the Campaigns tab of the main menu's Add-ons section, with its artwork.
Every chapter shows the right title and image, and starts the right map.
Starting a chapter shows its image on the loading screen, not the menu background or a black screen.
A save made in a later map loads with its chapter's image.
You can play from start to finish: every level transition works, and nothing is a dead end.
No purple-and-black checkerboards, ERROR models, missing sounds or unlit (black) surfaces anywhere.
The console (start with -dev -console) shows no errors about missing files from your project.
The official campaign is untouched: New Game still lists Black Mesa's own chapters, with their artwork.
Multiplayer maps: the loading screen shows your images, map name and player count, and you spawn where the image was taken.

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Removed the VPK from bms/custom/ (and any loose copies) before subscribing.
Subscribed to your own item, let Steam download it, and restarted the game.
Went through the In the game list again with the Workshop copy.
The item is visible to other people. Check its visibility on its Steam page, or ask a friend to open the link.

Your files