Default [Q] Problem uploading TWRP backup to DropBox using DropSync.

Hi.
I am using DropSync to upload TWRP and Titanium backups to DropBox. All was fine but then I noticed something that ''boot.emmc.win'' failed to upload. When uploading that file it goes to 99% and then fails. In attachment is screenshot from SropSync log.

Is that something serious and if I can restore successfully from DropBox because DropSync uploads and then deletes from phone to save space.
I have international HTC One M7 with ARHD 62.
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