Deleting files on Galaxy S5 not working

I launch Airdroid and connect via the website... with my user profile logged in on both the app and the website.
I navigate to a folder on my external SD card.

Click a file. Click the trashcan.

It appears to be deleted on the right hand side.

I click the refresh button.

It comes back.

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That happens with the latest versions of Chrome and FireFox.

Hi dankelly,
It maybe an issue related to the Android 4.4.x. Please contact us at support@airdroid.com to get the test version on this it. (Please tell the support that you need a fix on uploaidng/deleting files on Android 4.4)

Hope the test version will solve this issue