DDJ RX / Recordbox High Res Audio

So obviously FLAC audio files are out of the question for the DDJ RX (which sucks), which is why I've moved completely to AIFF. Similar to Apple lossless but uncompressed. The reason I bought the RX is because (As per the website) it DOES support AIFF, but Recordbox is giving me an error, saying that some files are "High Res Audio" and can't be synced.

Looking back on the Pioneer website, all I can figure out is that the
RX soundcard is 24 bit/48 kHz at a sampling rate of 44.1 kHz. I'm not a techy guy but I can output files correctly in Audacity. But nowhere on the RX page on the pioneer website does it specify
a "maxium file size" for audio files, besides, isn't that what we're going for here as dj's HIGH RES AUDIO?

So here's my questions:

1. What's the maximum file size for AIFF files that the RX can handle?
   Typical AIFF files are 32mb to 70mb.

2. Bit Rate: Purchaseed off of beatport, AIFF files are at or around 1411 kbps. What is the maximum bit rate for recordbox and DDJ RX?

3. Sampling Rate is obviously 44.1 - Bit Depth is obviously 24 bit

I need some specifics here if Pioneer is going to put a leash on my lossless files...