I don’t follow all the details of what you’re seeking to accomplish or have tried. Also, I don’t have experience using this plugin’s base64-related actions. Nonetheless, in case it’s helpful, here’s my implementation for using JSON to create a CSV file, a copy of whic is then attached to a thing, followed by the original CSV file being deleted.
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Send JSON to CSV Creatoraction from this plugin.
(I annotated the property names because they’re not appearing correctly on their own.) -
When CSV Creator has created your fileevent from this plugin.

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File Uploadaction from File Uploader Bubble API plugin, currently maintained by @Thimo (see also forum thread).
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Delete an uploaded filestandard Bubble action.


