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Did Paul ever see Jesus , , , ?
Yep, Paul sure did see Jesus, just like Peter saw Jesus, just like the Twelve saw Jesus, just like 500 saw Jesus.

"And that he was seen of Cephas, then of the twelve:
After that, he was seen of above five hundred brethren at once;
of whom the greater part remain unto this present,
but some are fallen asleep.
After that, he was seen of James;
then of all the apostles.
And last of all he was seen of me also,
as of one born out of due time."
1 Corinthians 16:5-8 KJV

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And he said, Who art thou, Lord?
When an invisible voice called to Samuel,
Samuel ran to Eli and said "Here I am".
Pauls very different reaction indicates that Paul was not hearing an invisible voice.
If Jesus had been invisible to Paul,
then Paul would have asked "Where art thou?"
rather than "Who are thou?"

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And the men which journeyed with him stood speechless, hearing a voice, but seeing no man.
Paul's companion did not see the man whom Paul saw.

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and when his eyes were opened, he saw no man
The verse says that Paul became blind,
which occurred after Paul had seen Jesus.

"Saul got up from the ground,
and though his eyes were open,
he could see nothing"
Acts 9:8 NASB