why is zip for dfu in nrf Toolbox not selectabel

[Christian Waldmann]

With nrf Toolbox 2.2.1 on android 6.0.1 (Google Nexus 7 or OnePlus 3T), I try to transfer an application firmware in a zip file UiBoardV0.4.1.zip, generated with "nrfutil version 0.3.0" from "nRfgo Studio" folder.

When selecting "distribution packet (ZIP)", I can see my archive in the file dialog, but the file is grayed out and is not selectable. All different file types are grayed out too.

When selecting "application" I can select the .bin and the .dat file (unpacked in a folder) and upload is working.

I am using SDK 11 with a nrf51822 on a custom board.

[Christian Waldmann]

After installing third party file managers (ZenUi File Manager or Total commander), I can select in the file select dialog an external file manager and the zip archives are selectable. DFU works fine.