How many characters are available for an email signature?

[AC Question]

I was trying to put on my phone the email signature I'm required to have inside the work email.
Copying it didn't work. Typing part of it was OK, then somehow I copied the company logo, but when trying to copy also the disclaimer in there, neither copying nor typing worked. Actually I typed the disclaimer, but the phone wouldn't save it.
Any ideas how to place a large signature there, or if possible to save everything as picture and place the larger picture there?