I am new to using this service and I have spent the last 3 days trying to understand how to implement the image uploading with a signature. The documentation does not specify that this is not possible, but neither does it show examples of concerts such as managing the complete flow. So I ask if it is possible to upload an image directly from my app using a signature provided by the server (in the style of s3), and so an example. What I tried to rate was completely unsuccessful. In fact, by making simple HTTP requests and including the "upload_preset" field in these, I get an error regarding the absence of the API key. However, from what I understand, and from what common sense tells me, this key should not be used in the client because that would mean making it public. I ask so how can I proceed because I'm stuck.
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