A Phase II Study to Investigate Lung Function With 2 Different Doses of Inhaled Glycopyrronium Taken With BFF Compared to BFF in Participants of 4 to Less Than 12 Years of Age With Asthma

Main Inclusion Criteria: * Participants who have a documented history of physician-diagnosed asthma * Participants who have been using a stable and regular inhaled corticosteroid plus one additional asthma controller medication. * Participants must have a Childhood Asthma Control Test score ≥ 19. * Participants must have a pre-bronchodilator FEV1 ≤ 95% of predicted normal value. * Body mass index (BMI) ≤ 95 percentile for age and body weight of ≥ 14 kg or higher. * Female participants who experience menarche must have a negative urine pregnancy test. * Received no asthma medication other than run-in BFF MDI BID and albuterol/salbutamol as needed. Main Exclusion Criteria: * Life-threatening asthma defined as a history of significant asthma episode(s) requiring intubation associated with hypercapnia, respiratory arrest, hypoxic seizures, or asthma-related syncopal episode(s). * Historical or current evidence of a clinically significant disease including, but not limited to cardiovascular, hepatic, renal, hematological, neurological, endocrine, gastrointestinal, or pulmonary. * Any clinically relevant abnormal findings in physical examination, clinical chemistry, hematology, vital signs, or ECG. * Hospitalization for asthma * Narrow-angle glaucoma not adequately treated and/or change in vision, bladder dysfunction, bladder outlet obstruction/urinary retention or any other conditions where anticholinergic treatment is contraindicated and may be relevant. * Use of Long-acting muscarinic antagonist (LAMA), either alone or as part of an inhaled combination therapy. * Current use of any systemic beta-blockers. * Respiratory infection involving antibiotic treatment. * Systemic corticosteroid use for any reason (including asthma exacerbations). * Participants with a known hypersensitivity to beta 2-agonists, corticosteroids, anticholinergics, or any component of the MDI. * Participants who are medically unable to withhold their short-acting bronchodilators and other asthma medications. * Any use of marketed (eg, omalizumab, mepolizumab, benralizumab, reslizumab) or investigational biologic. * Regular use of a nebulizer or a home nebulizer for receiving asthma medications. * Use of any immunomodulators or immunosuppressive medication.