Chrome Version (from "Settings > About Google Chrome"): 68.0.3440.70
Device Type: iPad Air-2 (11.4) iPhone 8 (11.4)
URLs (if applicable): mail/google/com/mail/mu

Behavior in Safari (if applicable):
Issue does not reproduce.

Steps to reproduce:
1. Open SP web on chrome browser. 
2. Open compose page.
3. Tap on attachment icon (paperclip icon @ end on subject line).
4. Select " Attach a file " option  & then select "browse" option.
5. Select any file or tap on cancel button.  
6. Observe the browser.

Expected result:
 on selecting file is expected to attached or on tap on cancel  pop up should close & user is expected to redirected to compose page.

Actual result:
Chrome crash & stun on full screen without  any tool bar.
See b/112066869 for original report, which includes a video and system logs.

QA has tested on another iOS 11.4.1 device (iPhone 6s plus > Chrome version: 66.0.3359.122) and the issue did not reproduce.