Use React filedropper for uploading the excel and store it in a specialization of entity FileDocument.
Use action: "Client" -> "Download file" to enable users to download it.
Hi Shankar Mundhe,
generalized your entity with FileDocument in domain model & on the page use file uploader then you can upload the file & store in the entity after that in the microflow use that domain model entity parameter & download file activity , then you are able to download the file document.