Hello,

I'm implementing a chat using MudBlazor UI. I'm trying to add drag'n'drop support. I don't upload the files immediately after they are added. Instead they are "stored" in a List of IBrowserFile, and when the user presses send on the message, they get uploaded:

protected List selectedFiles = new();

protected async void OnFilesChanged(InputFileChangeEventArgs e)

 {
  var files = e.GetMultipleFiles();
// validation
selectedFiles.AddRange(e.GetMultipleFiles().ToList());
 }

I have a MudFileUpload control, but I can't use its ActivatorContent for drag'n'drop. I need the whole chat window to be targetable for dnd, and in any case I don't have space in my UI for for an explicit drop zone.
I found this solution:
https://www.meziantou.net/upload-files-with-drag-drop-or-paste-from-clipboard-in-blazor.htm

which seems to work great, except there's one problem: if I do more than one drag'n'drop operation before I hit send, I get the well known error:

Exception || There is no file with ID 1. The file list may have changed. See https://aka.ms/aspnet/blazor-input-file-multiple-selections. Error: There is no file with ID 1. The file list may have changed. See https://aka.ms/aspnet/blazor-input-file-multiple-selections. at pt (https://localhost:7173/_framework/blazor.web.js?v=7:1:37745) at Object.readFileData (https://localhost:7173/_framework/blazor.web.js?v=7:1:37671) at https://localhost:7173/_framework/blazor.web.js?v=7:1:2900 at new Promise () at w.beginInvokeJSFromDotNet (https://localhost:7173/_framework/blazor.web.js?v=7:1:2857) at vn._invokeClientMethod (https://localhost:7173/_framework/blazor.web.js?v=7:1:65750) at vn._processIncomingData (https://localhost:7173/_framework/blazor.web.js?v=7:1:63139) at Rn.onreceive (https://localhost:7173/_framework/blazor.web.js?v=7:1:56780) at WebSocket. (https://localhost:7173/_framework/blazor.web.js?v=7:1:80728) || at Microsoft.AspNetCore.Components.Forms.BrowserFileStream.OpenReadStreamAsync(CancellationToken cancellationToken) at Microsoft.AspNetCore.Components.Forms.BrowserFileStream.CopyFileDataIntoBuffer(Memory1 destination, CancellationToken cancellationToken) at Microsoft.AspNetCore.Components.Forms.BrowserFileStream.ReadAsync(Memory1 buffer, CancellationToken cancellationToken) at System.IO.Stream.g__Core|27_0(Stream source, Stream destination, Int32 bufferSize, CancellationToken cancellationToken) at

I tried diving into this, even found a possible workaround from the same author:
https://www.meziantou.net/uploading-multiple-files-to-using-inputfile-in-blazor.htm
it didn't help. I understand that this was somehow solved in MudBlazor's MudFileUpload component, but going through the source it left me none the wiser. Can anyone advise?