I am using sharepoint 2013 , is this app not working everywhere? in my site wherever i have applied this , it is not working , ie not playing automatically. is the app affected?
I have faced this issue too. There was problem with Pictures library this month due to updates by MS. Check service messages in admin center below are details. It says service restored but there are still issues reported by people.
SP101452 - Picture Library Slideshow not displaying images
User impact:Users may have been unable to view images within a Picture Library Slideshow web part.
Latest message:Title: Picture Library Slideshow not displaying images
Updated:2017-05-17 04:16 (UTC)
Other problem causing this issue may be CDN policy by MS you need to enable CDN for you picture library. you can execute below script with Powershell
$creds = Get-Credential Connect-SPOService -Url sitename-admin.sharepoint.com -Credential $creds Get-SPOTenantCdnEnabled -CdnType Private Set-SPOTenantCdnEnabled -CdnType Private -Enable $true Set-SPOTenantCdnEnabled -CdnType Private Add-SPOTenantCdnOrigin -CdnType Private -OriginUrl */libname #Reference https://technet.microsoft.com/en-us/library/mt790767.aspx
Well, the feature of Picture Library Slideshow Web Part for automatically doing slideshow based on certain time duration will not be working for your Picture Library until CDN is enabled. Find Official Reference
So to solve the existing Issue for your app, Please ask your O365 tenant Admin to enable CDN.
Action Plan: Use Powershell commands to enable CDN by following this MS Article
Things to be aware about picture library. you can look at this for your reference. http://sharepointmaven.com/add-slideshow-sharepoint-site/
you can also read each and every property of slideshow webpart from this reference http://www.amrein.com/apps/page.asp?Q=5742