John Gill Commentary Acts 11:6

"upon which when I had fastened mine eyes, I considered, and saw the fourfooted beasts of the earth and wild beasts and creeping things and birds of the heaven." — Acts 11:6 (ASV)

Upon the which when I had fastened my eyes
Not of his body, but of his mind; for this was only in vision presented to him, when he was as Paul was, not knowing whether in the body or out of it:

I considered :
being intent upon this object, he considered in his mind what it was, and what it should mean; it being something strange and unusual; which came down from heaven, and out of it, and came so close and near to him, that it engrossed all his thoughts, and was the subject of deep meditation:

and saw four-footed beasts of the earth, and wild beasts, and
creeping things, and fowls of the air ;
not portrayed upon the sheet, but standing or walking upon it; the Syriac Version leaves out, "the wild beasts"; and the Ethiopic versions, "the creeping things"; but both are in the Greek copies, and in other versions.