A portal's file-size limit is a delivery constraint. It should not lead you to throw away the only high-quality scan or remove required pages just to make an upload succeed.

Keep a source copy and read the limit

Save the complete readable scan first. Record the receiving service's maximum size and accepted file types, including whether it allows several files. Check any stated requirements for colour, page order or legibility before changing the document.

Create a separate delivery copy with a clear filename. Epson ScanSmart's documented PDF save options include compression for colour or greyscale images and a choice to keep all pages in one file. The available controls depend on the software and scanner, so use the supported settings for your installation.

Adjust compression in a controlled step and save the result. Check the size of the actual saved file; the size of one sample page does not reliably predict the finished bundle. Avoid repeatedly overwriting the same copy, which makes it difficult to return to a better result.

Verify the smallest necessary information

Open the smaller PDF and check every page for completeness and order. Inspect small reference numbers, signatures, faint stamps and any fine diagrams that the recipient must read. Compare those areas with the larger source copy.

If further reduction makes essential content unclear, return to the last acceptable version. Consider an allowed split into clearly numbered files, or ask the recipient for an approved alternative delivery route. Do not silently omit attachments or change a required colour record to monochrome.

If you must rescan, choose a representative difficult page and test the capture settings before repeating the entire bundle. Compression and scan resolution are separate controls, and neither should be changed without checking the saved output.

Only upload after confirming that the delivery copy fits the limit and preserves the required information. Keep the source copy until receipt and any retention requirements are settled. A smaller file is useful when the recipient can still use it correctly.

Sources: Epson ScanSmart PDF save options.