Did client get my withdrawal of my proposal

[guinevere1964]

Good day, 

I withdrew my proposal this morning thinking the client would receive notification from Upwork.  I included a polite note. 
The client just contacted me to ask why I had not sent the sample of my work.  I sent my withdrawal approximately 3 hours ago. Does Upwork immediately inform the client of my withdrawal? 
I want to treat clients respectfully and feel that I have not done that. I have replied to his message now.
Thank you for your assistance.