File drop: Uploaded files of big size do not appear in folder

Hey guys,

I have NC 18.0.3 and created a folder for file drop.
The problem is that I can not upload files that are bigger than ~270-300MB.
I have set:
upload_max_filesize=20G
post_max_size=20G
max_input_time=3600
max_execution_time=3600
In web developer console if I upload smaller files I get PUT 201 OK and they appear in folder, if I upload bigger files I get 200 OK, and the page shows that file has been successfully uploaded, but when I check the folder there is no file. I have no idea where do files disapper. What could be wrong? Have anyone of you had similar issue?