[BUG] Dash upload components behaves differently on multiple file upload via drag & drop and file selector

[Fenigor]

Ccontext
A basic minimalistic dash app with an upload component that support multiple files upload of type ".pdf" on windows 11, but developing with wsl ubuntu 22

dash                 4.0.0
dash-core-components 2.0.4
dash-html-components 2.0.0
dash-table           5.0.0

• if frontend related, tell us your Browser, Version and OS

  • OS: Windows
  • Browser: Chrome and Edge
  • Version 144 and 146

Describe the bug

When dragging multiple files and dropping them on the upload component, only the first one triggers the callback.

Expected behavior

Both files to be sent in the callback in the backend

[camdecoster]

Thanks for the bug report! Could you please provide an example app that demonstrates the problem?