Frequently Asked Question
S-Drive File Area no longer showing on Mobile/S-Drive not working in Salesforce App
Last Updated 5 years ago
Lightning pages developed prior to Winter '20 release are only designed to work in Desktop form factor. Salesforce released a new Mobile App. In order to make it respect your page layouts, you need to edit your lightning page and Activate mobile as a form factor.

Related information:
Salesforce Winter ’20 Release Notes
https://releasenotes.docs.salesforce.com/en-us/winter20/release-notes/rn_forcecom_lab_record_pages_on_mobile.htm
Related information:
Salesforce Winter ’20 Release Notes
https://releasenotes.docs.salesforce.com/en-us/winter20/release-notes/rn_forcecom_lab_record_pages_on_mobile.htm