Hi Aitlahmid,
Greetings from Syncfusion support.
We have checked your reported problem. But unfortunately, we are unable to open the attached sample. The reported issue will occur when the controller actions are called or invoked for server side operation.
We suspect that you are expecting a demo sample with FileManager for Blazor server side application. For your reference, we have prepared a sample.
Refer the sample link below.
To know more about the FileManager component. Refer the below links.
Please let us know, if you need any further assistance.
Regards,
Sowmiya.P