I haven't looked at Syncthing in a few years. What's the best way to get files on an iOS device, without syncing them all to the device? (I use this a lot in D

I haven't looked at Syncthing in a few years. What's the best way to get files on an iOS device, without syncing them all to the device? (I use this a lot in Dropbox to grab a picture or something and use the OS share functionality to send it to Slack or whatever.)