Before 2017, when replacing files, your only option was to do this on a showcase-first basis, and replace all instances of a file within one single showcase. You can read more about that here.
But if you want to replace one file across multiple different showcases, we need to change perspective, and approach it from a file-first basis.
1. Click the 'Files' tab of the website at https://app.showcaseworkshop.com.
2. Find the particular file that needs replacing in multiple spots. You can use regular old search for this - that's the 'Search all files' box in the right corner.
3. Select the file, and then to see everywhere this file is located (i.e in what showcases, in what hotspots etc), select the Usages button - this looks like a small question mark in a bubble.
4. Click this to see the Usages:
5. You will be shown a list of everywhere this file is linked across my different showcases.
Pro Tip: All of those slide references are links. If you need to go edit just one of these slides, you can click directly on the link to be transported to that particular slide in that showcase. Super easy.
6. Click that button that says "Replace All Usages". This takes you to the file library where you can choose a file to replace those files with. Upload a file like usual, using the same old "Upload files" button you're used to.
Note that even after you click that big orange upload selected button, you will still get one more chance to check:
7. Click ok! Do it!
8. A change in file counts as an "edit", and like any other edit, it needs to be published. So if you replaced the file in 6 different showcases, remember you still need to go and publish each of those 6 showcases to get the new file showing up to your Viewer users.
We don't publish automatically as part of the "Replace All Usages" process, because you may be wanting to make multiple changes and check things over before publishing. We're leaving the publishing power in your hands! God speed.
(Are you sick of the word 'file' yet?)