Trying to migrate from Heroku - Images in S3 bucket not showing, add new image crashes app

Hi, I am trying to migrate my Rails 7 app over from Heroku to Railway. I managed to deploy the app, migrate the DB, and set up a DB backup to S3.

BUT none of my attached images (stored in S3) are showing up in the Railway-deployed app, and if I try to add a new image the app crashes. All images (existing ones and adding new images) work fine in Heroku still.

I get an empty error - not very helpful:

I, [2022-11-02T06:31:25.034636 #120] INFO -- : [8a1f130e-6718-4a29-9f9f-d3a27f200e35] Completed 500 Internal Server Error in 7025ms (ActiveRecord: 94.6ms | Allocations: 106325)
F, [2022-11-02T06:31:25.036160 #120] FATAL -- : [8a1f130e-6718-4a29-9f9f-d3a27f200e35]
[8a1f130e-6718-4a29-9f9f-d3a27f200e35] ActionView::Template::Error (convert /tmp/ActiveStorage-118-20221102-120-zx3huu.jpg[0] -auto-orient -resize 150x150> /tmp/image_processing20221102-120-yfhkye.jpg failed with error:
[8a1f130e-6718-4a29-9f9f-d3a27f200e35] 54: <% if review.images.exists? %>
[8a1f130e-6718-4a29-9f9f-d3a27f200e35] 55: <% review.images.each do |image| %>
[8a1f130e-6718-4a29-9f9f-d3a27f200e35] 56: <% if review.images.attached? &&[image/gif image/jpeg image/png]) %>
[8a1f130e-6718-4a29-9f9f-d3a27f200e35] 57: <%= link_to image_tag(review.image_as_thumbnail(image)), image, class: "img-thumbnail border-0 px-0", target: :_blank %>
[8a1f130e-6718-4a29-9f9f-d3a27f200e35] 58: <% end %>
[8a1f130e-6718-4a29-9f9f-d3a27f200e35] 59: <% end %>
[8a1f130e-6718-4a29-9f9f-d3a27f200e35] 60: <% end %>

At first I thought it was an issue with imagemagick but now I think it's the S3 storage - not 100% sure on the cause. I posted more details here but there's not much Railway knowledge yet on stackoverflow:

Can you help?
Update - It seems like it's happening only for images I already uploaded. Is it possible that Heroku adds something to images uploaded to ensure they're unique, that I would have to do in the code using Railway?