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I found a few things that you might like
Article from long island past and present
If you search the NARA catalog https://catalog.archives.gov/advancedsearch using just Camp Upton and then checking photographic material you will find a large number of photos.
The Library of Congress also has some photos https://www.loc.gov/photos/?q=%22Camp+Upton%22&sp=1&st=slideshow
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Dear Mr. Larsen,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located 10 series in the Records of U.S. Army Continental Commands (Record Group 393) that includes records of Camp Upton. For access to these records, please contact the National Archives at Washington, DC - Textual Reference (RDT1) via email at firstname.lastname@example.org.
We also located 354 items and 1 file unit of Camp Upton photographs located in the series titled American Unofficial Collection of World War I Photographs, 1917-1918. Please note that the photographs have been digitized and may be viewed using the Catalog. If you have any questions regarding these photographs, please contact the National Archives at College Park - Still Pictures (RDSS) via email at email@example.com.
Due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgement as well as a substantive response to your reference request from RDT1 and RDSS. We apologize for this inconvenience and appreciate your understanding and patience.
Further, you might want to review a previous History Hub response about Camp Upton as it provides a lot of valuable information. It may be accessed here.
Finally, we searched online and located some resources that might be helpful to your research on the history of Camp Upton including the History of Camp Upton available on the Brookhaven National Laboratory website and material relating to Camp Upton on the website of the Library of Congress.
We hope this is helpful. Best of luck with your research!