Hi @erica_poisson ,
Thanks for sharing the info.
Yes, the "memory" means the server-side memory hosted by Esri when printing the report, it does not relate to the memory of the computer on the client-side.
When printing a summary report, you cannot insert images in a repeated way (for each record). However, you can insert images from a summary perspective. I think this issue does not relate to image based on the information you shared.
Since it is a summary report, technically, the server-side load or the output content should be in a similar level no matter the count of input records. It is a little strange that you can print 509 records successfully but failed with 1193 records...
Would you mind sharing the XLSForm and report template file with us to look into? If it is possible, you can send them via email to me.
Thanks,
Zhifang