"Upload to SD" opens a file dialog.
please add an icon to upload to SD right beside .gcode files that OctoPrint already got, right along the others, like:
"additional data", "download" "remove" "upload to SD" "load" , "load and print"
It looks like there is some information missing from your bug report that will be needed in order to solve the problem. Read the Contribution Guidelines which will provide you with a template to fill out here so that your bug report is ready to be investigated (I promise I'll go away then too!).
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I'm marking this one now as needing some more information. Please understand that if you do not provide that information within the next two weeks (until 2017-01-19 20:30 UTC) I'll close this ticket so it doesn't clutter the bug tracker. This is nothing personal, so please just be considerate and help the maintainers solve this problem quickly by following the guidelines linked above. Remember, the less time the devs have to spend running after information on tickets, the more time they have to actually solve problems and add awesome new features. Thank you!
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@AndKe AFAIK the file manager plugin already supports this.
Since apparently some of the required information is still missing, I'm closing this now, sorry. Feel free to request a reopen of this or create a new issue once you can provide all required information.
This is nothing personal. Thank you for your collaboration.