What is Reddit's opinion of Album?

Here's the PlayStore Link if it shows up as compatible on your Xperia.

But if it doesn't here's APKMirror's Link

Sony Album. Great gallery app. I use it all the time on my Z3c. I just hope that it works on anything other than Sony devices :-)

Ah okay. How do you feel Google Photos is better for the camera?

Personally I switched to the Sony Xperia Album app since it feels more snappy than Simple Gallery.

: Gallery/Photo album app options :

How to transfer ?

Install Syncios/Syncdroid on your PC. , It's completely free. Connect your iPhone. Open syncios. Then backup all folders containing photos to your PC. Uninstall that programme.(You can also use it if you want that software) Connect your Android , manually copy paste those folders to your phone. Done !
If you are using SD card. Just copy paste those folders to SD card & instert sd card in your phone. All photos will be there when you open any gallery app. )
I will also suggest you to backup all photos to Google Photos. So, that you have online backup.

That way you will have 2 reliable backup. So, that even if you lost your phone or something happens to your phone, You will have a backup.

1 online backup - [Google Photos]
1 offline backup - [photos in your PC]
Photos in your phone. Use google photos sync functionality. It will also help you If you are using other apple device at the same time & you need to see your photos in iPad /iPhone or PC.
You are new to Android. I will suggest you to take a look at these app list that I made for new Android users. I covered almost 138 apps with links , apart from social apps & common google apps. You may find some app useful.

Check it out. Reply If you find it useful.

I know! Sony took out Xperia Transfer to movie media from phone to SD Card.

I use FX File Manger