Similar to how the FileUpload component supports uploading of severat files to a a URL via post, is there any plan to maje the FileInput component attach several files to a model parameter?
We don’t plan such feature since this is out of the scope of this component. The idea of FileInput is to upload small file/image as single base64 value.
It is a bit of an inconvenience. If I do not have an endpoint to post or do not want to make a whole endpoint for this purpose alone I need to use the FileInput, which does not support multiple files as well as you say is intended for small file. In the usecase where I want to have say a ticket, with a description and several screenshots, I can't input then a List<byte>. I would need to make a component for adding several file inputs components.
All this to say it is a bit of work shifted on whoever is using the library for a seemingly standard usecase 
Thank you for the clarification though
You can use RadzenFileUpload without endpoint. Check the demo "Upload client-side without Url".