Hi, I am trying to use the FileManager component from Syncfusion but it requires some custom controllers for managing file operations (https://blazor.syncfusion.com/documentation/file-manager/getting-started). So, I need to know in these cases when third party components require this functionality what is the appropriate way to define a custom controller. If this is not allowed, what is the alternative option? I've tried to follow the instructions of Syncfusion without any success.