Best answer by Erik BrinkView original
When we use the preview component in the web GUI we don' t get the result we expect. Instead we get an error which we can't explain. Do we need to adjust some security settings? To me it looks like the preview component needs to access local file storage.
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To perform the file caching the IIS Application Pool user(Identity) needs read and write rights to the "App_Data" directory.
This was already needed for using a file upload control storing a uploaded file temporary until the record is saved.
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