I can't send a file bigger than 20MB. What can I do?

The Issue:

Gmail does not support sending files bigger than 20MB. this can happen in other email clients as well

Solution 1: Choose HTML as the export format

HTML is a much smaller file and if the file is still too big you can split it into multiple files (see solution #3 for instructions) 

Solution 2: Share via Google Drive

Instead of gmail (or any other app), choose "Save to Drive" 

Press "Save"

Scroll through the notification tray from the top - you will then see the upload progress of the file. When the file is fully uploaded to Drive, click on the notification

Press the icon with 3 dots located next to the conversation file 

Turn on "Link sharing" and press "Copy link"

Open your email app, write a new mail and paste the link in the mail body.

Solution 3: Split the file into multiple smaller files

In the "sharing methods" option, click on settings icon next the the selected format

 Then:

1. Turn on "Split Files"
2. Choose how many messages in every file
3. Save (on the top-right corner)

Solution 4: Connect your desktop computer to your phone via USB

You can transfer the files to your desktop via USB. 

Just connect your phone and browse to "SMS Backup/Conversations" directory in your phone's internal memory