Uploading fails with "POST size too large"

[pcardoso]

I implemented a UIActivity subclass using Flickrkit, but when uploading I get a "POST size too large" at the end. Any hints?

...
2015-11-23 16:14:43.048 foo[8220:2746780] file size is 781673
2015-11-23 16:14:43.049 foo[8220:2746780] Sent 4096, total Sent 778240, expected total 781673
2015-11-23 16:14:43.050 foo[8220:2746780] Upload progress is 0.995608
2015-11-23 16:14:43.050 foo[8220:2746780] file size is 781673
2015-11-23 16:14:43.050 foo[8220:2746780] Sent 3433, total Sent 781673, expected total 781673
2015-11-23 16:14:43.050 foo[8220:2746780] Upload progress is 1.000000
2015-11-23 16:14:43.981 foo[8220:2746851] <?xml version="1.0" encoding="utf-8" ?>
<rsp stat="fail">
    <err code="93" msg="POST size too large! Try something smaller, mmkay?" />
</rsp>