Welcome to the forum!
Thanks for repoting.
I have not used OpenAI Prism before but wanted to verify if the problem is reporoducable.
Using OpenAI Prism via an internent browser with URL starting wtih https://prism.openai.com/?u=
in the middle panel at the bottom find
when clicking shows
I do not get the option to upload. However I am also not signed-in to an OpenAI account.
After signing-in
Using Windows 11, clicked on a image in this forum,
then pasted it into the Chat box.
No errors reported.
Then deleted the image from the Chat box.
Copied the image to my Desktop as Coffee machine.png
Then using Upload files & photos
No errors reported.
Can you give step by step instructions so we can try to reproduce the problem.
Also use F12 key to open the developer tools and look for errors reported.
In doing the same using Chrome, these are noted.
/api/project-files/upload-plan:1 Failed to load resource: the server responded with a status of 502 ()
b63323c505d5b182.js:1 Cross-Origin-Opener-Policy policy would block the window.closed call.
(anonymous) @ b63323c505d5b182.js:1
b63323c505d5b182.js:1 Cross-Origin-Opener-Policy policy would block the window.closed call.
(anonymous) @ b63323c505d5b182.js:1
b63323c505d5b182.js:1 Cross-Origin-Opener-Policy policy would block the window.closed call.
(anonymous) @ b63323c505d5b182.js:1
b63323c505d5b182.js:1 Cross-Origin-Opener-Policy policy would block the window.closed call.
(anonymous) @ b63323c505d5b182.js:1
b63323c505d5b182.js:1 Cross-Origin-Opener-Policy policy would block the window.closed call.
(anonymous) @ b63323c505d5b182.js:1
b63323c505d5b182.js:1 Cross-Origin-Opener-Policy policy would block the window.closed call.
(anonymous) @ b63323c505d5b182.js:1
/_next/image?url=https%3A%2F%2Foaisdmntpreastus2.blob.core.windows.net%2Ffiles%2F00000000-dd68-71f6-8f1d-444874f61fec%2Fraw%3Fse%3D2026-05-14T13%253A40%253A44Z%26sp%3Dr%26sv%3D2026-02-06%26sr%3Db%26scid%3D1d1ad5cd-e4c9-4873-9726-6cac73efcea9%26skoid%3D02b7f7b5-29f8-416a-aeb6-99464748559d%26sktid%3Da48cca56-e6da-484e-a814-9c849652bcb3%26skt%3D2026-05-14T13%253A29%253A55Z%26ske%3D2026-05-16T13%253A29%253A55Z%26sks%3Db%26skv%3D2026-02-06%26sig%3Ddg%2Fy8vFEz5BDgaEUFRj787ToWfbEfr6Zha7OBlXk4WY%253D&w=1920&q=75:1 Failed to load resource: the server responded with a status of 400 ()
In the lower left there is a way to contact support@openai.com






