Supported:

Amazon
ebay
shopify
Etsy
Paypal
Fedex（only website）
USPS
stamps.com
shipstation
J&T express
DHL
shipping easy
ORDORO
XPSship
FLASH express
POSHMARK
KERRY express
ninjavan
easyship

Does no support:

endicia
shipworks
shipwire

Use Adobe Acrobat Reader DC with "Snapshot" function:

ups
easypost
shippo