The forum software doesn't know anything about what an NXP file is, so it won't be related to old/new. To it, an NXP file is identical to any other non-image binary file.
Due to some tweaks to how the NXPs are built, NXPs built with these versions do tend to be larger. Even though the filesize limit for uploads is set at 16MB, in practice files that are large (but still under this) can have issues on slower connections usually due to timing out.
I would recommend uploading them elsewhere - Dropbox is usually the go-to around here for those who don't have their own web server - and posting a link.