I have created a custom form in the backend and it is working fine for single image browse. If I select only one image then it is working fine. My requirement is, I want to select multiple images with the browse button. If there is any alternate solution then please let me know also.
If your form is rendering from UI form component then using
isMultipleFiles option you can Defines whether multiple files can be uploaded.
For more reference go through Magento Devdocs
I hope it helps!