Does running the Add Attachments on a feature class remove attachments that already exist?

[EricHeinrichs]

I have a feature class of a couple of thousand line features, that I have attached pictures to.

Now, I want to update the feature class by loading in more features, and running the Add Attachments tool, and add the pictures to the new line features.

I just want to make sure that my existing attachments won't be affected by this. 

[NeilAyres · Accepted solution]

As far as I recall, add attachments does what it says on the box.

It adds them leaving existing attachments unscathed.

[EricHeinrichs]

Thanks for your help, Neil!

I transferred everything into a testing GDB, ran the Add Attachments, and everything remained intact, and it added the attachments to the new features.

[NeilAyres]

Just make a copy of the original data first, just to make sure.