Hi @YOUSSFI RAJA Thanks for reaching out. If the share point exposes an HTTP endpoint you can import those apis in API Management and you can do a REST call to SharePoint and get the file.
Please refer for more information: https://learn.microsoft.com/en-us/azure/api-management/import-and-publish
Let me know incase of further queries, I would be happy to assist you.
Please 'Accept as answer' and ‘Upvote’ if it helped so that it can help others in the community looking for help on similar topics.