Currently you can add XSL code to the XSLT box under table flattening in the REST data source connector. However you have to paste the text. I would like to be able to browse for a specific file. Specifically so a can place that file in a git repository.
We created some custom XSLTs for some more challenging APIs (the table constructor didn't suffice). Currently we have to copy-paste their contents to the portal which is poses some maintenance challenges as you can probably imagine.
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Add XSL file directly to REST data source connector
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