diff --git a/Important-tips.md b/Important-tips.md
index 0a0ca37..3869394 100644
--- a/Important-tips.md
+++ b/Important-tips.md
@@ -15,8 +15,14 @@
 ### Webtoon:
 * KCC support both cut and uncut chapters. In second case program expects parts of a single chapter per directory.
 
+### USB upload:
+* It's recommended to drag and drop the final mobi/epub directly into the `documents` folder on your Kindle.
+Users have reported using Calibre incorrectly and breaking the formatting the mobi, causing large margins and slow page turns.
+* If you are on macOS and use a 2022+ Kindle, use Amazon USB File Transfer (no login). Android File Transfer was previously reccomended but is much worse. 
+OpenMTP might also work.
+
 ### Calibre:
-* Calibre can be used to upload files created by KCC.
+* Calibre can be used to upload files created by KCC, if you know what you are doing.
 * **Don't convert files created by KCC with Calibre!** Any conversion process will corrupt the file!
 * Don't use Calibre reader to preview files created by KCC. It can't parse them correctly.
 * Add cover of the book to Calibre record if you want to see it in Kindle library view.