Uploading file to sharepoint online using .net standard 2.0 in Asp.net core 3.1 application

[kinunga]

Target SharePoint environment

SharePoint Online

What SharePoint development model, framework, SDK or API is this about?

💥 SharePoint Framework

Developer environment

Windows

What browser(s) / client(s) have you tested

• 💥 Internet Explorer
• 💥 Microsoft Edge
• 💥 Google Chrome
• 💥 FireFox
• 💥 Safari
• mobile (iOS/iPadOS)
• mobile (Android)
• not applicable
• other (enter in the "Additional environment details" area below)

Additional environment details

• browser version
• SPFx version
• Node.js version
• etc

Describe the bug / error

I used CSOM for .NET Standard to upload a file on sharepoint in my web application (ASP.net core 3.1).
The upload is working well on my dev. environment (Windows/Visual studio 2019). But when i deploy my app on linux server (ubuntu). The upload doesn't working, it shows me this message error: Server relative urls must start with SPWeb.ServerRelativeUrl has anyone got an idea on why am I getting this error ?

Steps to reproduce

1.Using CSOM for .NET Standard to upload a file on Sharepoit in a Web application (ASP.net Core 3.1)
2.Test the upload on dev. Environment (Windows / Visual Studio 2019). In my case, this is working well
3.Deploy the app on linux server (ubuntu). The upload doesn't work, shows this message error: Server relative urls must start with SPWeb.ServerRelativeUrl

Expected behavior

File uploaded on sharepoint for both envirnoment (dev.environment "Windows / Visual Studio 2019" and on linux server "ubuntu")

Thank you for reporting this issue. We will be triaging your incoming issue as soon as possible.

[kinunga]

I found what was wrong, I don't know why, but "Microsoft.SharePoint.Client.List.RootFolder.Folders.GetByurl("folder name") doesn't work on linux server (tested on ubuntu) but working well on my windows dev. evironment.

[rshingavi97]

Could you provide the code snippet in order to upload the file to shareoint site

[github-actions]

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