The image attachment sizes are different when using Deepthink.
However, I'm unsure what they are. Just that they are much less than when not using Deepthink.
When using Deepthink, it actually lets you attach files that are too big.
Then, you use up one of your ten Deepthink prompts per day for it to come back and tell you, "I'm unable to read the attachment", implying that you might be able to do something to it (for example, change a large text file to UNIX / DOS / UTF-8 / etc.) to get it to work, but you will then use up another prompt after it tells you that it "can't read" it again... the problem is that the file is too large and it's not telling you that.
Please fix Deepthink so that it informs the user of the maximum attachment size when the user attempts to attach something that is too large, and does not use up any compute and/or one of the user's ten prompts per day.