>...But I'm wondering, can I communicate from an external react webapp to premiere pro?   Yes, once you write a CEP panel that's hosted within PPro, and listens to your external webapp.  >can i send a file to premiere pro and have it save the file to the cloud from an external app? I know that sounds like a simple question... 😉 A CEP panel is a web page, with some super powers; it can talk to the local file system, and drive the host app's scripting interface. As the frame.io panels show, it's possible for a panel to download files to the local system. PPro itself only works with local files; no web assets. However, your panel can render sequences, thereby creating a new media file, then upload that new media.  >is that possible from the external webapp?  Again, that's up to your CEP 'listener' panel. Your PPro panel can listen to [whatever you want], then use the PPro API [however you want]. >...can they [ExtendScript APIs] do almost anything premiere pro can do?  Yes; here's the documentation.  > is it possible to embed some sort of iframe to an external premiere pro into a react webapp?  Yes.  Best approach = Spend some time with the PProPanel sample, set a bunch of breakpoints in the ExtendScript (using VSCode).  ... View more

PProPanel shows how to access and change the parameter streams, associated with an effect.  Note: Not all Lumetri settings allow for programmatic manipulation; testing with your actual sequences and applied effects will tell you whether the provided access, will work for your purposes. ... View more

1. No. 2. Using our APIs, you can get and set the XMP metadata associated with any projectItem. ... View more

Cool; I think you're describing PPro's current behavior. 🙂 Each project item is handled by an instance of a PPro Importer plugin. Whenever PPro needs to know anything about a given project item, it asks the importer, which then does whatever's necessary to provide what PPro asked for. Additionally, whenever PPro gets sent to the OS background (user switches to another app), and whenever PPro comes back to the front, every Importer is alerted (and responds, by disconnecting/reconnecting from the media, or whatever needs to happen). For Importers that are supporting growing media, PPro will ping them every N seconds (setting in the prefs), giving the Importer a chance to update, from the actual (slightly larger) media.  When N is longer than the editor's patience will allow (think: editing highlights for a FIFA game before half time), we give them a way to trigger that 'every N seconds' refresh, ahead of schedule.  ... View more