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Let’s start with your title. You are incorrect. Nitro’s thumbnails are future-proofed.
Nitro doesn’t work with folders inside the level ‘/Users/username/Library/Containers/com.gentlemencoders.nitro/Data/Library/Caches/File System/FullSize-1’
Throwing all thumbnails into one folder is asking for troubles, I’m afraid to witness soon or already witnessing.
You are right. You are asking for trouble. Please do not manipulate the Nitro Previews folder. The organization and format is private to the app. Do not make subfolders. The app will make additional folders (e.g., FullSize-2) when needed to optimize file system performance. The same is true for smaller sizes.
If this goes on, I have to ask “what will happen if I reset the image counter of the camera?” I cannot find a system of ignoring and not ignoring an image.
The characters after the file name encode unique information about the file, and thus resetting the image counter is fine.
are existing – but why does Nitro refuse to generate thumbnails?
I cannot tell based on this description. See if you have thumbnails in the other folders (e.g., Minis). The app avoids creating large previews when they aren’t needed.
Besides, the context menu with the command “Miniaturbilder erstellen” is far too often absent. For what reason I cannot generate new thumbnails in “Edit mode”? In Capture One “Voschaudateien neu erstellen” is possible in all edit modes if there’s a filmstrip visible.
Build Thumbnails >IS< available in Edit mode, but not for the image currently being edited (because thumbnails are built as you edit). If you leave edit mode, but are still viewing the filmstrip (so there is a large image visible), you will see the menu item appear. You can also use it in Edit for images that you are NOT editing by right-clicking on them. I'm sorry that you think the app was so poorly engineered that it cannot handle duplicate file names, or resetting of image counters, or that it would dump millions of files into a single folder. If you have found a bug with thumbnailing, please try to create a series of steps and I will try to fix it. That said, I will not go into deep(er) detail about how the app handles thumbnails.