Can't write in a maped folder on windows

I recently installed OMV 4.x on my rasberry pi 3. After doing all the settings required to create SMB server i mapped my Shared folder on windows 10. First time it was all okk . but after restarting my pi i was not able to write in my shared folder . Windows said " you need permission to acces the folder". I also checked all the permisions in omv but all the things are as it was earlier. I had done installation and all the procedure 3 or 4 times but i was not able to solve this problem. If anyone knows or familier with this problem then please help me. Thank you