When adding an attachment to an email in Command Center, here is a list of the supported file types:
.

Images

.jpg

.jpeg

.png

.gif

.svg

.webP

.bmp

.ico

.tif

.tiff

Audio/Video

.mp3

.mp4

.midi

.flac

.avi

.mpeg

.mov

.webM

Documents

.csv

.txt

.text

.pdf

.psd

.ai

.id

.eps

.word

.dot

.doc

.docx

.xls

.xlsx

.ppt

.pptx

Other

.html

.shtml

.htm

.css