For achieving this specific requirement, I have used an Html file uploader and a power automate flow that receives the request and creates a file in the SharePoint document library specific folder.
The file uploader HTML code snippet, that I have used.
The JS code that I used for posting the form-data with "mimeType": "multipart/form-data", to my power automate flow.
Following is the power automate flow that, triggers When a HTTP request is received.
For convenience one can copy the expression below.
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A successful run output.
After a successful run, the file is added to the specific document library folder.
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