A reaction that looks clear on your phone may need a different sharing copy when you send it over a limited connection. Fesi includes an export-quality preference so you can choose between Original and Compressed output for supported saves.
Quality, duration and frame shape are separate decisions. Changing an export preference does not mean you recorded the source again, and it does not guarantee a particular file size.
Start with what the receiving person needs
For a quick review, the recipient may only need to see the expression and hear the conversation. For later editing, keeping a higher-detail source or original-quality copy can be more useful. Decide whether you are sending a review copy, a finished post or material someone else will edit.
Check the available export setting before preparing the file. On iOS, look in Settings under Export Settings. Android exposes Original and Compressed quality choices; its compressed preference is labeled 720p. Labels and the route to them can differ across platform versions.
What Original does and does not mean
Original is the option to start with when retaining source quality is your priority. It cannot add detail that the camera did not record. A dark, soft or poorly framed recording will not become sharp simply because you choose this option.
Also distinguish a normal save from an edited output. Trimming, reframing or combining clips can require processing even when your quality preference is Original. Do not interpret the word as a promise that every edited file is a byte-for-byte copy of the source.
When to try Compressed
Compressed is useful to test when transferring the original is inconvenient. The Android save implementation prepares a 720p copy before publishing it to device media. Actual size still depends on the footage, length and encoding; there is no universal percentage reduction.
Compare a short representative reaction first. Look at hair, moving hands, faces in shadow and small details you care about. Listen to the audio as well. Keep the version that serves the purpose rather than assuming that the smallest file is always the right one.
Changing quality is not changing the shape
A compressed portrait video is still portrait. Choosing square or landscape output is a framing decision that can remove source edges. Likewise, shortening the recording changes its duration rather than its resolution.
If the issue is unnecessary footage, use Trim & Share. If the issue is how the clip fits a screen, consult the format guide. Use quality preferences for the output-quality decision, not as a substitute for those controls.
Keep a verified source and check the delivered copy
Exporting a sharing copy does not require deleting the original reaction. Keep the source until you have verified the result in its destination. Some receiving services process uploads again, so inspect the delivered or downloaded copy if that is what your audience will watch.
If you later clear temporary exports, first make sure the version you want is saved somewhere permanent. The temporary-export cleanup guide explains how those working files differ from original reactions in the Library.