how to popup this window:
my result like this:
Hi,
The dialog you posted is a CUBA screen containing a table, FileMultiUploadField and a Remove button.
The documentation clearly states:
The component is a button; when it is clicked, a standard OS file picker window is shown, where the user can select multiple files for upload.
https://doc.cuba-platform.com/manual-7.1/gui_FileMultiUploadField.html
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