Reported on the Wikisource mailing list.
Commons is rejecting uploads over 100 MB.
[2017-08-02 08:00:49] LOG.CRITICAL: Client error: POST https://commons.wikimedia.org/w/api.php resulted in a 413 Request Entity Too Large response: <html> <head><title>413 Request Entity Too Large</title></head> <body bgcolor="white"> <center><h1>413 Request Entity (truncated...) [] []
Happens with quite a few items, e.g.:
010OnceAWeek10londuoftBwDec1863ToJun64/log.txt:[2017-08-02 08:00:49] LOG.CRITICAL: Client error: POST https://commons.wikimedia.org/w/api.php resulted in a 413 Request Entity Too Large response: <html> <head><title>413 Request Entity Too Large</title></head> <body bgcolor="white"> <center><h1>413 Request Entity (truncated...) [] []
where the resultant 010OnceAWeek10londuoftBwDec1863ToJun64.djvu is 279 MB.
The Commons upload limit is 4 GB, but these must be done in multiple parts.