Yes. If we need to do any editing on the scans, whether to add bleed, convert to CMYK or to adjust the resolution, we will need your scans as individual TIFF or EPS files.

We recommend against embedding your images. Linked images are much more efficient than embedded ones.
If you are using Adobe InDesign as your layout application, we recommend you make use of the Package option, which will gather your fonts and images for you.