I can also confirm that the Daz freestuff forum allows external links. My Missus figure and ShareCG link was just "officially" added to the Free Human Figures database over there. CGbytes also allows linking and has a general user freestuff area, users may attach .zip and various other file types to posts there, attachment file size is about 25 mb. Site admin at CGBytes stated that the freestuff forum there is a "free for all" zone, in that attachments are not evaluated in an official capacity. There is also a QA tested marketplace freebie catagory that members may submit to. So... Renderosity does not allow attachments nor does it allow linking. A severely hobbled user experience when compared to other sites, even the most restrictive ones.

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W10 Pro, HP Envy X360 Laptop, Intel Core i7-10510U, NVIDIA GeForce MX250, Intel UHD, 16 GB DDR4-2400 SDRAM, 1 TB PCIe NVMe M.2 SSD

Mudbox 2022, Adobe PS CC, Poser Pro 11.3, Blender 2.9, Wings3D 2.2.5

My Freestuff and Gallery at ShareCG