Strapi upload plugin: upload files programmatically using a different plugin

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Hi there,

I’m currently trying to solve this challenge: I want to upload media files by just sending over a URL instead of the whole file. I want to build it using a custom plugin, that handles the file download to buffer and that is afterwards calling the Strapi upload plugin programmatically and let it do the rest of the work.
Unfortunately, I can’t find the right way to trigger the upload plugin. Did somebody already realise a similar project and knows, how to handle the upload plugin ?

So I need to find out, how to correctly call this service:

   const resp = await strapi.plugins['upload'].services.upload.upload({
                data: {
                files: {
                    path: filePath,
                    name: imageName,

with a file buffer / stream whatever