Unable to embed a link in Microsoft PowerPoint

So I am trying to insert in PowerPoint a link that is capable of opening another PowerPoint, for some reason, it results in an error message. I would appreciate if someone can help me debug this.

By the way, the file definitely exist.

Edit: operating system MacOS BigSur office version:16.52

Hyperlinks can't contain spaces, those must be substituted by %20. Write the link in the form: Task%20Achievement/How%20to%20write%20a%20letter.pptx

I do not have a same environment as yours, but on my Mac environment, the path shown on your image seems to be correct.

The linked "Presentation 2.pptx" as following image shown, could be opened successfully.

Please try a full file path for a test.

Right-click the file (How to write a Letter) in Finder > Get Info > Copy the path of your file, which starts from "Users". Please also ensuer your current account has read and write permission to this file.

Then paste the path into Address bar, and add "file:///" at the beginning of the path like the following image.

If a full path does not work, please move your files to other location to have a check.