Currently it is not possible to insert pictures. This task requires to open the associated application to get the picture and when getting back to insert the picture into the document.
Steps to Reproduce:
User Profile Reset: No
User-Agent: Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:51.0) Gecko/20100101 Firefox/51.0
Patch in gerrit: https://gerrit.libreoffice.org/#/c/41150/
Ximeng Zu committed a patch related to this issue.
It has been pushed to "master":
tdf#106370 Android: add ability to insert pictures
It will be available in 6.0.0.
The patch should be included in the daily builds available at
http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More
information about daily builds can be found at:
Affected users are encouraged to test the fix and report feedback.