Failed Uploads And How To Add Photo

Will you please help me? I am desperate.  Job has 3000 photos, I uploaded it then realized some of the photos in the middle were missing, didn't know how to add them so I deleted all photos and started uploading them again.  Came in this morning and the 1400 or so have uploaded but then photos started showing up as failed. Some with the 500 error.  I don't know what to do now.  

Thank you

I would suggest you delete them and try the FTP upload method. 

FTP is a superior method of file transfer in general. 

See if that makes any difference. 

https://www.picturespro.com/sytist-manual/articles...

If you have just some photos missing, you can upload those missing photos and when viewing the photos for the gallery in the admin, click the Rearrange Photos tab then you can rearrange them by filename to put them in order. 

500 error  means the server is rejecting them for some reason. You would need to reupload starting where it left off.