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Step #1 Locate your OST Files
Click File > Account Settings > Account Settings.
Account Settings

Now, click on the Data Files tab, select any OST file, and click on Open File Location button.
Select and Open File Location

Note: Generally, OST files can be found here irrespective of the Outlook version-

C:\Users\user\AppData\Local\Microsoft\Outlook

Note: It is to note that the AppData folder might be hidden; hence, the user has to unhide it first. To do so, in C:\Users\user, click on View tab > Options. Go to the View tab, expand Hidden files and folders, and select Show hidden files, folders, and drives.

Step #2 Export your OST File as PST
In MS Outlook, click on the File tab > Open & Export > Import/Export. This will open up the Import and Export Wizard.
Here, select the Export to a file option and hit Next.
Import and Export Wizard

This will open up Export to a File dialog window, select Outlook Data File (.pst) option and hit Next.
select v

Now click on the required email account and select the item that you want to export as a PST file and hit Next.
select OST file to export in PST

Now click on the Browse button to save the PST file to the desired location and hit Finish.
Finish the process to save OSt in PST file

Congratulations! You have successfully converted an OST file to PST. Now we will explore ways to import this file to Gmail.

Step #3 Import PST to Gmail via. G Suite Migration for Microsoft Outlook (GSMMO) tool
G Suite Migration for Microsoft Outlook (GSMMO) desktop application lets the user import the PST file to the user’s Gmail account. The process is described below:

In any browser, search for G Suite Migration for Microsoft Outlook and download the application.
Launch the application by searching for it.
G Suite Migration for Microsoft Outlook

You will be asked to provide the login information, click Continue to proceed.
login G Suite Migration for Microsoft Outlook 

This will open up the sign-in page in your default browser.
open up the sign-in page

Next, you will be asked with a message that GSMMO wants to access your Google account. Scroll down and click on the Allow button.
Allow to access Google account 

If everything goes well, then you should see a confirmation message as shown below:
confirmation message

This will open up a new dialog window. From the drop-down menu, select From the PST file(s) option and click Next.
select the PST file

You will be taken to the location where all outlook PST files are saved. In step 1, if you have saved your converted PST file to a different location, then paste that location’s filepath in the Address bar.
The file is now imported, click Next to proceed.
PST file imported

Adjust the migration settings as required. Once done, click on Migrate.
Adjust the migration settings

This will initiate the migration process. Depending upon the size of your PST file, the process might take a while. Once done, you will be prompted with a message of successful migration.
successful migration done

Log-in to your Gmail account and look for the newly imported PST file in the left pane.
New PST file created

Congratulations! You have successfully migrated your Outlook PST file to Gmail.

Download and launch the software on your Windows system.
Select OST format, choose File or Folder mode, and add OST files for import.
Choose the Gmail account in the Export options where you want to migrate the OST file.
Then, enter the login details of your Gmail account – username and password and click on Authenticate User button.
Select the folder of the Gmail account used to import the OST file. Users have the freedom to create a new folder for the same.
In the end, hit Upload Now button and this begins migrating OST mailboxes to the Gmail account. This will take a short time.

Greetings,
Peter

Add your Gmail account to Microsoft Outlook using the IMAP settings. This will allow you to access your Gmail account in Outlook.

The manual technique for importing an OST file into Gmail accounts is rather difficult, with three stages. There is no direct way to complete this migration process. As a result, it is advised that data be lego 2k drive converted to PST  format first. Let's go through the work highlights you must adhere to in the manual procedure.

The best method for importing OST files into Gmail is to use Softaken Mail Importer Software. Perform OST file imports are possible for Gmail and IMAP server accounts. The Local data file extensions can be imported by users into their IMAP Mail Server accounts. In Gmail, Office 365, Hotmail, AOL, and other programs, importing MBOX, PST, MSG, EML, NSF, OST, and other formats is simple. With imported data, users can create a login. All versions of Windows OS, including 11, 10, 8.1, 8, 7, XP, and Vista, are supported. Users of this program might download a free demo version.

Visit here: https://www.softakensoftware.com/mail-importer.html