Maximum File Size can be uploaded to Amazon Textract.

The maximum file size that can be uploaded to Amazon Textract depends on the type of operation and file format you're using. For synchronous operations, JPEG, PNG, PDF, and TIFF files have a limit of 10 MB in memory. For asynchronous operations, JPEG and PNG files also have a 10 MB limit, while PDF and TIFF files have a larger limit of 500 MB in memory.

So, to answer your question directly: Yes, you can upload pictures larger than 5 MB to Amazon Textract, as long as they don't exceed the 10 MB limit for JPEG and PNG files. However, it's important to note that these limits are for the file size in memory, which may differ slightly from the file size on disk.

For the Bulk Document Uploader feature, which allows processing of multiple documents at once, the same limits apply: JPEG and PNG files have a 10 MB size limit, while PDF and TIFF files can be up to 500 MB.

It's worth noting that these file size limits are set quotas in Amazon Textract and cannot be changed. If you have larger files, you may need to consider compressing or resizing them before uploading to Amazon Textract for processing.
Sources
Set Quotas in Amazon Textract - Amazon Textract
Best Practices for Bulk Document Uploader - Amazon Textract