How to install splunk app in remote splunk using Splunk REST API

[mini]

I have installed the app in the local splunk using the Splunk REST API endpoint

https://<host>:<port>/services/apps/local

but when I tried to install the app in remote splunk .It gave error like

"Cannot perform action "POST" without a target name to act on"

 or "Unparsable URI-encoded request data"

I included the name(.tar or .spl file) and filename like how it is mention in the splunk docs

https://docs.splunk.com/Documentation/SplunkCloud/8.2.2106/RESTREF/RESTapps#apps.2Flocal

Using this endpoint .I can create the app in remote splunk but I want to upload the app 

I tried with requests module and postman. The same error came

is there any way to install the app in the remote splunk using postman or requests?

Thank you in advance...

[PickleRick]

Well, debugging the web upload process I get a POST action to

https://splunk.server/en-GB/manager/appinstall/_upload

But I doubt that it's the official blessed way to do it on your own.

The API though, indeed states that you either create an app instance with a path to a local file (to which of course the splunkd process must have access) or an URL or application name from Splunkbase.