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Deepak DineshDeepak Dinesh 

can we upload a file of more than 4 mb using a lightning component in Lightning out application

Best Answer chosen by Deepak Dinesh
Raj VakatiRaj Vakati
Are you using lightning:fileUpload ??

By default, you can upload up to 10 files simultaneously unless your Salesforce admin has changed that limit. The org limit for the number of files simultaneously uploaded is a maximum of 25 files and a minimum of 3 files. The maximum file size you can upload is 2 GB. In Communities, the file size limits and types allowed follow the settings determined by community file moderation. Guest user can't add files.

This component is not supported in Lightning Out or standalone apps, and displays as a disabled input. Additionally, if the Don't allow HTML uploads as attachments or document records security setting is enabled for your organization, the file uploader cannot be used to upload files with the following file extensions: .htm, .html, .htt, .htx, .mhtm, .mhtml, .shtm, .shtml, .acgi, .svg. For more information, see Upload and Share Files in Salesforce Help.