Attached is the screencast you requested. In the screencast, I attempted to change the folder icon for two different folders, "files" and "poly". The "files" folder is outside of Dropbox completely. The "poly" folder is a subfolder of the main Dropbox folder. As you can see, I was able to successfully change the default blue folder icon for the "files" folder to the red-brown folder icon. When I try to do the same thing to the Dropbox "poly" folder, it doesn't take. For a split second the title bar flashes to the red-brown folder color but then immediately reverts back to the original blue color. The end result is the folder icon is not changed at all for the Dropbox "poly" folder.
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Custom folder icons for subfolders under the main Dropbox folder have disappeared and can't be put back. When I try to put them back via any of the normal ways, they won't "stick", and the icon immediately reverts back to the default folder icon. I can apply custom folder icons to any folder outside of Dropbox, so the problem is clearly related to Dropbox. Custom folder icons were working fine with Dropbox subfolders as recently as a few days ago. I am on macOS Mojave 10.14.6 (the latest) and running Dropbox 79.4.143 (also up-to-date). These custom folder icons are important to me because they help me distinguish between them on the Dock. Without this customization, they will all have the exact same default Mojave blue folder icon.
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