Pasting an image in the file preview dialog replaces existing image

[SystemKeeper]

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Steps to reproduce

1. Join conversation and paste an image -> dialog opens
2. Copy another image to the clipboard and paste it to the dialog

Expected behaviour

The second image should be added to the preview dialog

Actual behaviour

The first image is replaced

Bildschirmaufnahme.2023-12-05.um.07.48.29.mov

Talk app

Talk app version: 18 RC2 and main