Filename seems to make NAS upload fail

Hi.

I get tons of failed upload errors to my Synology DSM 6.2 NAS.
[14:08:42] Operation begin
[14:08:42] Copying file. Source="G:\Capture\[20180625-20180703]_[dsc_0262].mp4", Destination="::{82AA9188-44E0-40B9-B956-43A10C315B4F}\::{6658ADF0-D5E5-4BEE-9660-78742F046756}/Backups/Temp/[20180625-20180703]_[dsc_0262].mp4"
[14:08:42] Getting properties (Size, Date modified) of "G:\Capture\[20180625-20180703]_[dsc_0262].mp4"
[14:08:42] Item: Size=1208923146, Date modified=2018-06-29T08:38:54
[14:08:42] Getting properties (Size) of "::{82AA9188-44E0-40B9-B956-43A10C315B4F}\::{6658ADF0-D5E5-4BEE-9660-78742F046756}/Backups/Temp/[20180625-20180703]_[dsc_0262].mp4"
[14:08:42] Unable to obtain properties of file "/Backups/Temp/[20180625-20180703]_[dsc_0262].mp4". Error=0x80070002
[14:08:42] Transfer restarting at position 0.
[14:25:18] Operation end
[14:25:18] Error 0x80043103
[14:41:57] Operation begin
[14:41:57] Copying file. Source="G:\Capture\[20180625-20180703]_[dsc_0262].mp4", Destination="::{82AA9188-44E0-40B9-B956-43A10C315B4F}\::{6658ADF0-D5E5-4BEE-9660-78742F046756}/Backups/Temp/[20180625-20180703]_[dsc_0262].mp4"
[14:41:57] Getting properties (Size, Date modified) of "G:\Capture\[20180625-20180703]_[dsc_0262].mp4"
[14:41:57] Item: Size=1208923146, Date modified=2018-06-29T08:38:54
[14:41:57] Getting properties (Size) of "::{82AA9188-44E0-40B9-B956-43A10C315B4F}\::{6658ADF0-D5E5-4BEE-9660-78742F046756}/Backups/Temp/[20180625-20180703]_[dsc_0262].mp4"
[14:41:57] Unable to obtain properties of file "/Backups/Temp/[20180625-20180703]_[dsc_0262].mp4". Error=0x80070002
[14:41:57] Transfer restarting at position 0.
I did some test runs. It seems to be related to the filename. The file has 1.18GB.

- test_[dsc_0262].mp4 - fails
- test_[dsc_0262X.mp4 - fails
- test_Xdsc_0262].mp4 - works

The problem seems to be related to the opening bracket "[". Not sure though ... ?!

However other similar files (exactly the same filename structure and filename length) pass without problem!

Any settings I could tweak on client side?

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