Assets may be uploaded directly in the browser or through Adobe Lightroom using the Tweak extension. (See Uploading Assets using Tweak Extension for Adobe Lightroom).
1- Click on the Upload assets button in Tweak
2- Click on Browse files to find the files you wish to upload. Alternatively, drop the files on the upload area. Your files will start to Upload to Tweak.

3- If you wish to add straight to a Collection, click on the Add to Collection button on the right of the dialog and select the Collection.
4- Your files will be processed for upload and metadata within the files extracted and presented in the metadata fields on the right of your screen.
5- If you’re a Super User, when all of your assets are ready to be accepted, you’ll see a green button on the bottom right, reading Accept XX Assets. By clicking on the button, your assets will automatically be available in the DAM and placed into the Collection you’ve selected.

If you don’t wish to accept all of the assets, deselect the assets you wish to reject and remove them by clicking on the the bin icon. On the bottom left of your screen is a Select All/Unmark All button and a bin icon which can be used to remove files from the batch.
If you’re a Contributor or User, you won’t be given the opportunity to approve the assets. They will appear in a pending state, awaiting approval. A Super User will need to upload the batch before the assets become visible to other users. (See Approving Pending Assets)
In the case of images, some embedded information will be extracted and appear in the Title, Description, Copyright Notice and Creator fields.