How to trigger conversion of .ota to .zigbee files?

How can I trigger the conversion of .ota files to .zigbee files without restarting deconz?

You can just rename the file ^^.
It same file, at restart deconz scan them and change the name again, IDK what you are trying to do, but you can use all extension type in the plugin on the file selector

ZigBee firmware is identified by the Manufacturer Code, Image Code and Version. On startup, the STD OTAU plugin will read all *.ota, *.ota.signed, *.sbl-ota, and *.zigbee files in ~/otau, and copy them to mmmm _ iiii _ vvvvvvvv .zigbee files, matching these attributes.

Oh ok, great. Thanks!