Cache-PHP uploads files to the cloud storage service, in the end, who is occupying the bandwidth?

I have a doubt, a Web server, a database server, a picture server, if the user uploads the attachment through the PHP program, then whether the attachment will occupy the Web server resources (bandwidth and CPU, memory)?

If you consume Web server resources, how do I upload a user picture (attachment)?
If not occupy, is there any theoretical basis?

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I have a doubt, a Web server, a database server, a picture server, if the user uploads the attachment through the PHP program, then whether the attachment will occupy the Web server resources (bandwidth and CPU, memory)?

If you consume Web server resources, how do I upload a user picture (attachment)?
If not occupy, is there any theoretical basis?

Of course the server, because it is PHP upload. You should use JS directly upload to the cloud server, or through the form directly to the cloud server, this depends on your cloud server support which.

The user consumes the bandwidth to the service side, and the server gets the data to the cloud, which also consumes resources.
If you just consume the resources of the client, then there is not enough configuration on the server to say that.

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