We want to introduce you to several cloud storage options accessible from your tablet or mobile phone . The services we feature always offer some free storage to start, which can then be expanded either through payment or other means. It's ideal to be able to upload and download files from your tablet, share them without actually having them on your device, or simply update shared files automatically. Here's a list of the best cloud storage apps for Android , with a comparative description.

Dropbox
It's possibly the most popular service in Spain. They offer 2 GB of free storage , expandable up to 18 GB if you refer friends. You'll get an additional 500 MB for each friend you refer. The app does pretty much everything Dropbox for PC or Mac does. Besides always having access to your files and folders, you can also share them by sending a download link to anyone via email. You can even edit text files directly within the app.
It's also fantastic that you can set up a Dropbox folder to automatically upload photos taken with your phone . Even better, you can specify when you want it to update: always using both Wi-Fi and mobile data, or only using Wi-Fi.
Another cool thing is that you can mark files as favorites for offline access.
Finally, you can set a password so that if you lose your tablet, no one can access it directly.
Download Dropbox on Google Play

Box
It's the oldest cloud service and one of the most popular in the US, especially for professionals. If you access the service from your PC or Mac, you get 5 GB free , but if you download the app, you get up to 50 GB . You can view and edit files. You can give your contacts access to your folders and allow them to see existing files and upload new ones. Any changes they make to that folder will be notified to you . This is great for teamwork.
The downside is that this application does not have the automatic updates or the security password.
Download Box on Google Play

Google Drive
Google Drive is another great storage option. It offers 5 GB of free storage from the start and also provides some integration with your Google Docs account . Google Drive will be Dropbox's fiercest competitor in the future. It allows you to access and share files via links. Furthermore, text files are editable, even by those you've shared them with. It opens all types of documents, including PDFs.
You can even transform some documents directly into Google Docs documents and upload them to your account.
You can access your favorite files offline . And what's even more incredible, you can even take a picture of a printed document, although honestly, this service doesn't work as well as one might hope.
The downside is that it does not have the automatic upload of photos or attachments that Dropbox does. Although there are subordinate applications that help you with that.
Download Google Drive from Google Play

Ubuntu One
Ubuntu One is divided into two applications: Ubuntu One Files and Ubuntu One Music . Both use the 5 GB of storage you receive upon signing up for Ubuntu One. As their names suggest, one is for files and the other for music. Before we continue, it's important to clarify that you don't need an Ubuntu operating system on your PC for it to work, but you do need an Ubuntu account to link the service to.
You can upload all kinds of files: music, video, audio, documents, etc., and access them from your phone or tablet. You can even choose a folder where photos from your phone will automatically upload from your SD card. And you can tell it to do it automatically or to sync at a frequency you specify , something the Dropbox app doesn't allow.
The files you have in the cloud can be shared by mail, by social networks with a link or even by Bluetooth.
The Ubuntu One Music application has a great feature besides letting you upload music; it has a streaming player that allows you to listen to your music over the internet.
It has a great control system to prevent uploading duplicate files that waste your space absurdly, and you can choose to only sync or stream when there is a WiFi connection.
Download Ubuntu One Files on Google Play
Download Ubuntu One Music on Google Play

Sugar sync
Although not as well-known in Europe, SugarSync probably offers the best service and gives 5 GB of free storage to anyone who signs up. It lets you do everything Dropbox does with its automated file and photo uploads. You can access, view, and even edit any type of file. It also offers the ability to stream music . And, of course, you can choose to have synchronization happen only when you have a Wi-Fi connection , or even only when your device is plugged into a power outlet to save battery.
It combines all the advantages of the previous systems which make it possibly the best solution.
Download SugarSync on Google Play